I get that way with my almost 6 year old son. I have recently realized that I need to just let him do what it is that he is going to do. They are only kids once. I have found that if something he is doing is making me frustrated I make up a fun activity for him and I do to together instead of what he is doing to make me upset. One of his favorite ones is to have kitchen dance parties. We get out pots, pans, bowls, spoons, anything we can....turn up the radio and just dance around and sing. I know it may sound kind of cheesy and I felt weird doing this at first because I am pretty sure my neighbors can see us, but to see the smile on his face is worth all the neighbors hearing me try to sing and danceing like a crazy person. Just try to remember that they are only little once and anything you can do now to just hang out with them will make great happy memories for both of you instead of like you said having her resent you later on and not have happy times. Good luck with everything. Congrats on the new baby too.