With what has happened to that poor girl, it may not be possible to just 'pull herself out of it'. Not to mention the massive damage she has taken purely from the abuse in her life, she is also dealing with a severe mental illness. To say 'snap out of it' shows a bit of ignorance of her disorder. She cannot pull out of sever bipolarness, it is a physical problem with her brain, and something that may never improve, reguardless of her treatment plans, medications, or any other factors. There is no cure for bipolar, she will suffer with it for the rest of her life.
Now, it is not fair that she has been cursed with this disorder (and trust me, it is a curse). What did she do to deserve it, along with the other horrors of her life? It is both unfair, and unfortunate, and there is nothing she, nor anyone else, can do to change things for her now. If she is bipolar, there is nothing that could have ever been done. It is a chemical imbalance in the brain, in effect, same as being diabetic. Even if all precautions are taken, if you have either medical problem severely, they will come to be. This is not fair, it IS life, but not fair.
I truly believe that very few people in this world deserve to suffer. So many people end up doing so, however. I'm sure we can all think of someone we know that is a great person and has had things happen to them they dont deserve. I would truly be saddened for a person who didn't know such a person, since there are so many good people in this world. What these people go through is unfair. But, in my mind, unfair and unfortunate often turn out to be the same thing.