I think it comes down to a set program in your brain. for years it was programed to "get wife back get wife back" that file needs to be deleted from your brain.
she is trying to reclaim what she thinks is still "Hers" before she loses it for good. to me, this is just another attempt to keep you riding her roller coaster. she is saying, "ok, i'm ready to act married" and you're supposed to jump.
ack, I'd think long and hard on this. if you don't want to close the door on this just yet, let her chase. you owe her nothing.