Because she is "temp checking" you as they call it around here. She wants to see if you are seeing anyone else, and is testing you to on how you are going to respond to it. She wants to know if she still has you as plan b. Plus the more you socialize, dress nice, take care of yourself, it raises your social and sexual attraction and value. The fact that she was home with your son, and you were going out and having fun may have something to do with it too.
