How can the relationship between two characters develop or heal if one is obstinate in refusing to talk? Trying to find a reason why a girl who refuses to talk to anyone or socialize, might go back to her old self and socialize again. I can't think of a way to do this without cheapening or lessening the reason why she became obstinate.
Imagine a character saying:
"I won't talk, I won't socialize, I won't do anything, because I want to die, but can't."
If a character develops that attitude, then I don't see how she will go back to her old self, which is literally the opposite. I am trying to think of a way, but I just can't and I feel it would make for some terrible writing if I try to use some sort of trick. I never read or saw a story where this happens, so I have no point of reference.