Heather- okay, this is REALLY hard for me to answer, I am totally triggered by this thread and am literally trembling at this point reading through this- but that's why I'm on here, both for aid and support, but more to live out my belief that through pain you can heal some of it by passing it on and potentially preventing long term trauma in others.
Okay here goes, bear with me. This is almost word for word what happened to me when I was molested at 12. I was not molested by a man, I was molested by a 13 year old girl. She was supposed to be my best friend. I am convinced she was raped/molested by either her jerk stepfather or father. She made me dance for her, watch porn, she played "doctor" with me which was penetration with her fingers, she even said "lets play the game where we lay on the bed and act like adults". It was always, "let's play a game". and yes, she did tell me not to tell. and there were times I said it hurt and I didn't want to play anymore. she was literally reenacting what some a hole made her do, and it made her feel better to make me go through it too. ugh Im like sobbing now. The difference is this --A., I was your daughter. I was so embarrassed, confused and ashamed about the whole thing that I didn't tell my mom for a few years. You need to give your daughters friend MAD props for stepping up. It's so normal to just want to hide it. When I did tell my mom, she was so passive and so worried it would create such a "social chaos" that she did NOTHING. nothing!! I went to her, divulged the most vulnerable information and she didn't defend me , turned her back on me and I still to this day HATE her for it. I have relentless anger problems for her, my so called friend, and her molester. What mom doesn't protect their kids?! It was absolutely mind blowing, and i can tell you it changed my life forever. Depression hit, nightmares hit, so then insomnia hit, then I went to drugs, then I said okay fine I will go with what I know and became totally sexually active, drunk all the time, dated bad people and now I have such bad nightmares I am petrified of sleeping as an adult. All I can tell you from my personal trauma experience is FIGHT. By all means necessary, protect your daughter. Maybe no sleepovers right now is a good idea no matter who with. I would suggest talking to I think you said "selena"s mom-I know that is NOT an easy task, but like I said you are in a full fledged battle right now. Your daughter was violated. It's at least worth trying. Past that, fight the system, call them every day, I don't care if this girl is 11-12 and goes to jail she is wrecking young peoples virginity and youth. She sounds evil/damaged and something big needs to happen. It will just continue otherwise.
As for asking your daughter too many questions- yes do this very carefully, and I would probably leave this to a professional. You are potentially what my therapist says "re-traumatizing" her by making her keep going through it again and again, and believe me that is very painful and not helpful in any way. I know you are trying to get answers and just help, but when it comes to assault, be careful. The fact that I am literally going through tremors and tears just writing about this and its been 24 years should give you some credibility as to how serious this stuff can be. Thanks for coming on here and asking for help and being a better mom than mine was.