First of all, welcome to Work It, Mom! -- I'm so glad you've found us. We have a really strong and very supportive community here and I think being part of it does help feel like you're not alone.
I often feel very torn as well -- and same as you, I love to work and I also have to work. I've not found a magic bullet, but what I do try to do is be present, be in the moment with my daughter when I am with her and also to try and focus on work when I am there... it's tough, but I try.