She looks great! I love that you haven't stopped concerning yourself with her condition though she is pregnant. Many people will breed a mare and turn them out...they do so much better with delivery when they are in shape!
Thanks everyone! She's being fed 4lbs a day of Buckeye Safe N' Easy, and around 15-20lbs of hay per day. She's never really been fed more than this. She gained weight quick, but muscling has taken a bit longer. I don't work her too often only because she is pregnant, but when we do I do a lot of transitions and hill work.