Someone please help!!?

I am in the worst emotional state of my life. k so this is what happened.. bear with me. I was with my girl all weekend, we spent time partying together, and had some amazing snuggle/ sessions.. it was very sappy and nice as usual. So while shes with me, her phone dies for a night, and on the sunday when she left, I could feel these very nervous/scared vibes off of her. When she gets home I know that her family and parents reamed her out hard talking about how shes not using her full potential with school, how shes inconsiderate yada yada. this clearly affected her hard. and I know that her family is very important. I know that she's trying very hard on her school right now, to make up for some slacking, and I know that its really important to her, I just don't understand why she tells me that she needs to be alone, and that she has no will to live. She is clearly hurting so badly inside, but she won't open up and tell me how shes feeling. She keeps telling me that it has nothing to do with me and that I should stop overthinking it, but I'm just so ******* worried. She took a bunch of pain killers a few days ago and ped out for like 20 hours. I think shes being selfish and not considering who shes affecting around her, and at the same time.. all I want to do is help her and love her.. because I know I can make her feel better, but shes just not opening up the way that she should be. Shes my best friend and my lover. I would do anything to make her feel better.. I just have no idea what to do. I do know that shes depressed, aparently doesn't want to be alive anymore, and she says she needs to be alone to concentrate on school since she was sliding a bit. Im feeling horrible inside.. I dont want to lose my baby. :(