<human>: Can you give me the gist of the text in a nutshell?

Hello. I (18M) met her (17F) 2 months ago after a two year break up with my old girlfriend and i think we love each other but somehow i get the feeling that i love her way more. I'm saying that i get this feeling because she usually gets depressed because of her boyfriend that too left her 6 months ago and shes way too self-conscious about herself, about her body and about her personality which she even said once that " I am not an interesting person ", and I can't figure out why she says this because she is the most beautiful, loving,caring, most interesting person in the world to me. We have gone out a lot of times and today was the day that I was gonna spend some time with her because we were gonna go and chill out in a park near her house.
The problem was that her sister (18F) keeps bringing her down, mocking her for everything and it makes her even more self-conscious about herself. And she gets in a pretty shitty state of mind and starts ignoring me. She likes me one day, and she ignores me the next.

Today her sister went full retard and said she was a drug addict ( she smokes weed sometimes and tried MDMA once which is basically ecstasy ) and started beating her for no fucking reason whatsoever. When she tried MDMA she thought she had confidence in sharing this experience with her sister and today she back-stabbed her and told her parents. They are gonna send her to a psychiatrist and she spent all day crying and i dunno what to do at all. 

She pushes me away when she is in this state of mind because as she told me before " I don't want to upset you, or ruin you " . I love her like no one else I've ever loved, and all i want to do is to be there for her and help her without her pushing me away. 

She keeps getting punished like this for no reason at all, like i said, she is one of the most loving and caring people Ive ever met. 
Someone please help me because i have no idea what to do ..
<bot>: I think we both love each other, but when she gets depressed she pushes me away because she thinks she's hurting me. She is way too self-conscious about herself and her family doesn't help at all.