Sorry, but you are just not getting it. She chooses to live the life she is living. She had the perfect opportunity to get out of it just a week or so back, but she CHOSE not to. If she did not want to turn tricks for drug money, then she would not be doing it. I know it sounds cruel to say it, but she is doing it because she wants to. If she was as miserable as you make her sound, she would have grabbed onto the help you were offering her just a few days ago. She is not ready to stop and it is HER CHOICE to continue.
The sooner you accept that, the sooner you can start to heal. Until then, you will continue to torture yourself.