Dinah was definitely raped, here's an except from The Book of Correct Record also known as The Book of Jasher:
“And in some time after Jacob went away from the borders of the land, and he came to the land of Shalem, that is the city of Shechem, which is in the land of Canaan, and he rested in front of the city. 2 And he bought a parcel of the field which was there, from the children of Hamor the people of the land, for five shekels. 3 And Jacob there built himself a house, and he pitched his tent there, and he made booths for his cattle, therefore he called the name of that place Succoth. 4 And Jacob remained in Succoth a year and six months. 5 At that time some of the women of the inhabitants of the land went to the city of Shechem to dance and rejoice with the daughters of the people of the city, and when they went forth then Rachel and Leah the wives of Jacob with their families also went to behold the rejoicing of the daughters of the city. 6 And Dinah the daughter of Jacob also went along with them and saw the daughters of the city, and they remained there before these daughters whilst all the people of the city were standing by them to behold their rejoicings, and all the great people of the city were there. 7 And Shechem the son of Hamor, the prince of the land was also standing there to see them. 8 And Shechem beheld Dinah the daughter of Jacob sitting with her mother before the daughters of the city, and the damsel pleased him greatly, and he there asked his friends and his people, saying, Whose daughter is that sitting amongst the women, whom I do not know in this city? 9 And they said unto him, Surely this is the daughter of Jacob the son of Isaac the Hebrew, who has dwelt in this city for some time, and when it was reported that the daughters of the land were going forth to rejoice she went with her mother and maid servants to sit amongst them as thou seest. 10 And Shechem beheld Dinah the daughter of Jacob, and when he looked at her his soul became fixed upon Dinah. 11 And he sent and had her taken by force, and Dinah came to the house of Shechem and he seized her forcibly and lay with her and humbled her, and he loved her exceedingly and placed her in his house. 12 And they came and told the thing unto Jacob, and when Jacob heard that Shechem had defiled his daughter Dinah, Jacob sent twelve of his servants to fetch Dinah from the house of Shechem, and they went and came to the house of Shechem to take away Dinah from there. 13 And when they came Shechem went out to them with his men and drove them from his house, and he would not suffer them to come before Dinah, but Shechem was sitting with Dinah kissing and embracing her before their eyes. 14 And the servants of Jacob came back and told him, saying, When we came, he and his men drove us away, and thus did Shechem do unto Dinah before our eyes. 15 And Jacob knew moreover that Shechem had defiled his daughter, but he said nothing, and his sons were feeding his cattle in the field, and Jacob remained silent till their return. 16 And before his sons came home Jacob sent two maidens from his servants' daughters to take care of Dinah in the house of Shechem, and to remain with her, and Shechem sent three of his friends to his father Hamor the son of Chiddekem, the son of Pered, saying, Get me this damsel for a wife.”
Dinah was definitely raped, here's an except from The Book of Correct Record also known as The Book of Jasher:
“And in some time after Jacob went away from the borders of the land, and he came to the land of Shalem, that is the city of Shechem, which is in the land of Canaan, and he rested in front of the city. 2 And he bought a parcel of the field which was there, from the children of Hamor the people of the land, for five shekels. 3 And Jacob there built himself a house, and he pitched his tent there, and he made booths for his cattle, therefore he called the name of that place Succoth. 4 And Jacob remained in Succoth a year and six months. 5 At that time some of the women of the inhabitants of the land went to the city of Shechem to dance and rejoice with the daughters of the people of the city, and when they went forth then Rachel and Leah the wives of Jacob with their families also went to behold the rejoicing of the daughters of the city. 6 And Dinah the daughter of Jacob also went along with them and saw the daughters of the city, and they remained there before these daughters whilst all the people of the city were standing by them to behold their rejoicings, and all the great people of the city were there. 7 And Shechem the son of Hamor, the prince of the land was also standing there to see them. 8 And Shechem beheld Dinah the daughter of Jacob sitting with her mother before the daughters of the city, and the damsel pleased him greatly, and he there asked his friends and his people, saying, Whose daughter is that sitting amongst the women, whom I do not know in this city? 9 And they said unto him, Surely this is the daughter of Jacob the son of Isaac the Hebrew, who has dwelt in this city for some time, and when it was reported that the daughters of the land were going forth to rejoice she went with her mother and maid servants to sit amongst them as thou seest. 10 And Shechem beheld Dinah the daughter of Jacob, and when he looked at her his soul became fixed upon Dinah. 11 And he sent and had her taken by force, and Dinah came to the house of Shechem and he seized her forcibly and lay with her and humbled her, and he loved her exceedingly and placed her in his house. 12 And they came and told the thing unto Jacob, and when Jacob heard that Shechem had defiled his daughter Dinah, Jacob sent twelve of his servants to fetch Dinah from the house of Shechem, and they went and came to the house of Shechem to take away Dinah from there. 13 And when they came Shechem went out to them with his men and drove them from his house, and he would not suffer them to come before Dinah, but Shechem was sitting with Dinah kissing and embracing her before their eyes. 14 And the servants of Jacob came back and told him, saying, When we came, he and his men drove us away, and thus did Shechem do unto Dinah before our eyes. 15 And Jacob knew moreover that Shechem had defiled his daughter, but he said nothing, and his sons were feeding his cattle in the field, and Jacob remained silent till their return. 16 And before his sons came home Jacob sent two maidens from his servants' daughters to take care of Dinah in the house of Shechem, and to remain with her, and Shechem sent three of his friends to his father Hamor the son of Chiddekem, the son of Pered, saying, Get me this damsel for a wife.”