I had a similar situation with an exGF years ago. Her friend was fishing for info. Suddenly pretending to be concerned about me and asking me all sorts of questions about who I was dating or if I was dating and that sort of thing but in a round about way, apparently she didn't think I was intelligent enough to see through the ruse.
I wouldn't read too much into it. If it's due to you making a 180, then she will probably do what she can to get under your skin in trying to illicit a specific reaction, something you have changed about yourself or your attitude that she doesn't want to believe you're capable of doing.
I'm slowly coming to the understanding that our WAW's need to see us as the problem, I don't mean WAW's in general, but I've read your situation and in ways it's like mine. When we shift from being the problem they need a way in which to make us the problem again in order to ease their burden of guilt.
Hang in there man, you're an inspiration to a lot of people. I know you're an inspiration to me. I've read your situation from post one up to the present and it gives me hope that I can make it as well.
Dash
Me 43: Her 34 M 08/22/2005 Son born 12/31/2006 Suspicion of EA 10/10/2008 EA confirmed 10/11/2008 WAW 10/13/2008