You know... I didn't realize the kids were your step-kids. Another thing that could be going on with her is jealousy. The kids call you first; they are probably defending you to her; she sees their loyalty to you, and I bet at some level this is really hacking her off. (They're HER kids, after all). Hence, no call from her when she went to take care of HER daughter. See?
Because she is mad at you, she doesn't WANT them to love you still, though I don't think she'd ever say that out loud. But since they do, they will continually remind her that you aren't as bad as she's trying to make you... and she probably really hates to have that reminder right now, regardless of where it's coming from.
