Just getting started piecing it back

[jersting]

I'm looking for some quick advice.
My wife came over last night to pick up kids. She left her car running and the kids did not want to leave when she came in to pick them up. She went out and shut her car off. When she came back in I asked if she was hungry and she said no. I asked if she had eaten and she said no. I warmed up some left overs that I made for the kids the night before and told her that it wasn't as good as she makes, but it is eatible. When she sat down to eat it I went in and played with the kids. When they left she gave me a hug and kiss on the cheek. She called me at 10:30 last night and I did not answer. I did not return call because she left no message. Today when she came to pick up the kids she was looking miserable. She asked me how I was doing and I replied with GOOD. I asked how she was and she just shrugged her shoulders. I asked what was wrong and she said nothing. I said I replied to your e-mail today and she said ya, 2 hours later. As she was turning to walk out of my office I asked again what was wrong and she said I get the point. I followed her to her car and asked what point that was and she said that "I know you don't want to talk to me". I asked how she figured and she said because I won't answer when she calls. I said that I didn't know she called until 12:30 and she wouldn't have wanted me to call that late. She just gave me a dirty look and drove off. What I need advice with is do I call her tonight or not. I really don't understand what she expects of me right now. I am trying to be supportive, but I am also trying to not get myself wrapped up in her games. My instincts say not to call and wait for her, but I don't want to give her reason to keep walking away either. What should I do?