In Twilight how did Rosalie become a vampire?

Well firstly, Rosalie was very very pretty, and more than anything she wanted the perfect handsome prince, a perfect baby and a huge house. She met her prince charming and they got engaged. One night when it was snowing heavily, she was walking home when she came upon for prince and his friends. They were very drunk and started to beat her up and started to rape her we all think. After they finished beating her, they just walked away and left her there to die in the freezing cold snow. Fortunately, carlisle came along, and thought that it seemed like too much of a waste to let her die, so he took her home and bit her and changed her into a vampire.