Your daughter being at this age, and her brain is still growing up, sending her to get help or counselled could help her, but there is also a huge chance that doing that will have a negative impact on her. Sometimes counselling is not really the right choice. What you need to do is go to her side, and ask her in a friendly sort of way, ask her why does she like going to parties, or doing those stuff.
Don't mention about grounding her, or saying that she is wrong... At her age she does not understand that her actions at that kind of age is disgusting and wrong. All she thinks is that it is fun to do so. Or she might want attention, or love...Try and give her space and time, and not just scold her.
Don't confront her, because that way you can never get information from her. The reason she might not want to tell you is because, she thinks that she is an adult or she can take care of her own business, or she thinks she knows everything, you might scold her and so she would have to stay and talk with you for an hour or longer. Try to talk to her as less as possible, don't nag her because that way you won't get anything from her.
Her age wants conversations that are not too braggy or annoying, such as continuous questions: Why did you do this? Or What are you thinking?... Instead tell her what you went through when you were young, as a story sort of way, don't just go straight on and ask her questions about why she would do those stuff. It is very obvious that Amy thinks that she is a grownup or want to be.
What you can do is not attack her at that point such as asking "Do you think you are a grownup, and saying you are not old enough, so you shouldn't be doing those actions" You at your adult point of view, you may think that she is not old enough, but instead of saying anything about what her age can't do, you should instead tell her, or let her watch shows, and not saying anything at all at first, let her watch it, and show her what she could become. Don't ask her "See, you would become this way" instead don't say anything, during the show or video. You could find these type of girls in videos on youtube(maury show type your girl's case(teen wants a baby...)) Extream cases: If this does not help at all, and she continue what she does, you could try doing it the hard way.
Stripping everything you had given her, and after the experience tell her that you love her. ALWAYS remind her that you love her. Crying won't help because she might not care.
Stripping: taking every thing away from her: phone, bed, closet, clothing, every piece. If she runs away, you find her, Act: BRING her to the police station, and tell the police that your daughter will not be missing, and they don't need to find her. At this time, at her age, your daughter would test and see if you live down to what you say, bringing her to the police station tells her that she won't be ever cared for, she can't survive out there, and she might know that.
Amy at her age should cry at this age and tell you that she is sorry.
You need to use your powers as a caretaker to take her someplace away from these problems, and then you need to take a more active role in your child's life. You need to be talking to your kid every day, you need to know what she does in her life, and you need to influence her. Enough of this "finding out" crap.
Honestly, your daughter sounds like she needs professional care. That's very young for all this to be happening.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.