Hey NW1...welcome, and sorry you're here. CeMar is right...do not, under any circumstances, have children with this woman until you work this out, and are freely communicating about this issue.
My first wife had a libido loss after we got married, and she even suggested that if we got a "quiet" divorce, but still acted like we were married, her libido would probably improve. She got better without the divorce. Of course, she was also psychotic, but that's another story.

Has she read the SSM book? She should. And I think a little more info on her medical challenges might help some of here understand where she's coming from.