I don't have Bruce's finesse, so my tool would be the proverbial 2"x4". But no whacks for you. Again, this post-D DBing is frontierland, and we are crossing virgin ground.
You seem to have a handle on the subtle nature of your XW, and her exploration of adopting a baby, and mentioning that to her D was perhaps 1) a testing of your interest in her; 2) evidence of her loneliness and need for connection; and 3) a sign of yet more internal chaos.
Wes, she came once more to you in a time of need/concern. And you took care of her - with a very big AOS. Sure, you slipped in your desire to be the father(sperm donor?) of her very hypothetical baby, but I'd let it go, and not mention it again. Does she seem appreciative of your AOS or get closer to you afterward (meaning during the next week or so)?
Her saying that she has "no one to have one with" is great news. Much better than her saying she's planning to have John Mayer's baby or to be in an R w/ an OM, and start mentioning that.
IMHO, a tad of mystery (while staying positive and continuing with timely AOS and WOA) might help your sitch. If she thinks that she has you in her pocket, this may continue this semi-limbo your sitch is experiencing.