Conclusion
Bobbi is definitely very immature in not being able to see through the ruse that her "friends" used on her. She wants to believe that this will help her in her career as an actress. She wants to continue seeing these people. Undoubtedly, they will perform similarly when the mood is right. She is giving herself to a terrible way of life.
There is no doubt in my mind, however, that with therapy, Bobbi can be made to understand that this kind of friendship is not good and honest. No one can actually tell her that. She will have to learn that, and it seems, painfully. The actual sexual experience she went through, though, seems of little importance. She does not seem harmed by it in her own terms.
Her fear of her parents stems from her adolescent need for freedom, but she really fears her parents' rejection. She is forced to make light of the experience in front of them so that they do not condemn her, too. I have counseled her parents to give her room. Bobbi needs room to grow.
I did see Bobbi for several sessions after this, and I think, made some honest progress into her immature personality. Only the near future will tell if the guidance was strong enough and our relationship honest enough for her to appreciate and act upon.