HI miragex~
I agree with all the responses received. Seeking therapy for yourself, concentrating on what has motivated you to allow this to go as far as it has, would be your first and best tactic at this point.
You stated:
"She is in such a bad state and probably because of her mental health, she could even tell everyone about our relationship".
Something that I also thought about regarding your involvement with this girl, and considering her mental status at this point in time, I couldn't help but to take into consideration that because of the fact that she isn't emotionally/mentally stable, it's a tough call on if it isn't beyond herself TO create further problems for you, (whether or not they are intentional).
Sometimes, our best intentions become our worst deeds. I should know, I've made my fair share of them.
From the sound of it, she's in a place receiving the help she so needs. And it doesn't sound like there is much you can do for her at this time. With that said, the best that you can do for her is to seek professional assistance for yourself. Regain the control you had before you met this girl and securing what your priorities ARE = your wife and child.
I can so relate to what you are going through...been there done that, in a sense. I know of the complications from playing the mercenary. Through all of my hardships of availing myself to the aide of those troubled, I've learned how easy it is to lose sight of self in the process, and allowing self to get tangled up in a mess of matters that started out as a generous deed, yet ended up in a disaster of sorts. Sounds to me that this is what may have happened to you.
It's wonderful that you have attempted to help this girl to find a better existance, unfortunately, though, you cannot create happiness FOR her. That is her journey to seek for herself. Granted, you can guide her, but only she can obtain it.....but NOT at the cost of another, such as in your case. You are sacraficing your morals and values, crossing your own boundaries and chancing to lose what matters most to you for the sake of another who "might" benefit from this.
You also stated:
"Now that she is going through this mental crisis, I am really scared for her. What is she going through. Will she improve with treatment. What should I do".
I can relate to you being fearful for her. But, as already mentioned, she is presently in a position where she is receiving the care she requires.
In all honesty, I'm more concerned about YOUR present status. Will YOU improve? Can you obtain the necessary assistance that you DO need in order to ensure your own self, (back to where you feel secure about your life again).
You love your wife and child? They are what matters most. Use that as your center point. Focus on that. Use that to maintian direction. Ask yourself, "How will I be IF I lost them?" "Is this girl worth that sacrafice?"
Don't get me wrong....there is nothing wrong about helping someone in a time of crisis. However, there is something wrong when that crisis demands that you deny yourself your own sense of security, maybe?
I apologise if I might sound a little brass, or blunt. NOT my intention. It's just, I've been down that road so many times before that it has literally altered my own journey. The only sad thing about my experiences are, that they were in vain. I tried to help those who couldn't help themselves. And I honestly thought I was doing a good thing. At the time, I was. Intentions were genuine, but results were detrimental to MYself.
I wish you the best. Keep us informed. We all care and are here for you.
Shangrala