What is this vampire movie? (Cancer, Suicide, Vampirism)?

Okay, I know I have the movie somewhere but I can't find it on the shelf. Basically, there's this girl who is an dancer and wears a purple wig. She has cancer and there's this long scene of a message she left her boyfriend about how she was killing herself and it's very touching. They f ind her dead body in the tub with blood all over the place but later on you find out she's a vampire. Only the women can make other people vampires. She makes her boyfriend one and her boyfriend tries to make another girl a vampire but he just ends up killing her accidentally.