Yes, I think it's worth trying if you're both willing to put in the work. For the sake of your child/children, I think it's worth fighting for as hard as you can.

Why does she think it's dying? (I'm asking rhetorically) I think the answer to that question might help you decide whether it's worth working towards. It sounds like something you guys should have a deep and open discussion about. Sometimes that's not easy for people to do. I agree with AmyLF's suggestion for counseling, if your wife will agree to it. Sometimes there are misinterpretations about actions or things that are spoken. A counselor may be able to ask just the right questions to find out what's going on and offer advice. If your wife is not interested in counseling, I'm not sure there's a whole lot you can do. I'm sure you already know that one person can't love enough for two. I'm sorry you're going through this.

Only you know. Honestly. Dying isn't quite dead yet. Have a serious conversation. Get couple counciling if you need a mediator. If the love is there and the want to work it out is there, then do. It's worth trying if you both want to sort it out. If not, if the other person is really ready to let go, you really can not force it. Let it go. You have to have a very sirious, calm, collected conversation about it though to know for sure.

Sometimes you gotta say fuck it.