Like you would tell me, pull back. Detach. Don't try to read into it. I do the same and it just gets me spinning. It could be she is confused and rethinking her decision. It could be that she sees you pulling away and just wants to keep you in play. It could be to assuage her guilt...by asking about your grandmother, she shows herself that she is a nice person and not the "evil" person who is having an A.
Pray, detach and let God take over.
Me: 40, W: 40 M: 15, T: 18 D - 10, S - 7 D announcement 6/7/2014 A discovered 7/20/2014 (but denied by W) Still living together and sharing same bed