Oh my. Your poor wife has suffered for years with mental health issues, and she's still suffering. I don't believe she's "cured" by any means.
I don't know what you can do at this point -- if she's left, I don't see how you can get her back. You can't really go get her and drag her back.
You really DON'T know if she's retrievable or not. She may decide to come back at any time. The state of mind that she's in is unstable -- I don't think SHE even knows what she's going to do next. But one thing is for sure--it's not your fault.
And if she decides not to come back, you cannot blame yourself for THAT. You can't MAKE her come back, my friend. If you forced her, she'd just leave again, and you could get into trouble besides. Don't blame yourself. She needs help. I hope she gets it. You will be in my prayers my friend. Please keep posting if need be. We'll be here. God bless and take care. Hugs, Lee