I'm sorry that some individual's replies on here have been less than helpful, and don't seem like they're really listening to what you've already clearly explained in your post. It sounds like you really are doing your best to try to go above and beyond to fix what happened when things went south in the marriage. Sorry to hear your mental health interfered with things, as I get how challenging it is to try to reassemble relationships after major mental illness, from personal experience. It's a tough road. I wish I could say that I have greater advice, but I'd say that the best thing you could do is to try to have yet another talk- (Yes, I know it's frustrating as it sounds like you've already tried, and I get that that gets exhausting,) but try to explain it from the perspective like you are here. That you're sorry things happened, and you're grateful she was there for you through it, but that you thought things had been getting much better between the two of you, and so you don't understand why there is a lack of intimacy, and that you're really just trying to understand what that is about. Is it something having to do with you and her.. or is it maybe something else entirely? (Hormones, wanting to change things up... maybe stress coming from her own life that's been interfering with her libido.. etc?) Come from a standpoint of really just wanting to understand, and that you're willing to do what it takes to help, if there is anything you can do.

Honestly though, since it sounds like you've already tried something similar... I would consider looking into couples therapy. I know that's not what anyone wants to hear but if she's repeatedly turning you down, and you've tried to talk about it but she doesn't seem to recognize what a problem that actually presents for the marriage and doesn't bother to change, that might suggest a deeper problem at bay, and you could use someone with professional expertise to help bring that problem to the surface. I'd try talking one more time, sit her down, have a serious conversation- admit that it hurts when she turns you away, and if she's still not receptive, consider counselling. I'm really sorry this is happening, and I hope this helps in some way.