I have had a woman walk away from me after her asking me to be her white knight and after me doing just that. I can't say she was all better when she left, but I do know, once she made her mind up to go back to "whatever" that was it. She wasn't into us anymore and there was nothing I could do or say. And I just loved her to death, but it didn't matter. You can do what you can do to try to save this, but if she wants to go, she will go and there won't be anything you can do about it.
Not being appreciated for all I have done for some family and such: I have found that that is a common theme with people. You just know you did what you could and that you did good and it has to be good enough for you.