Well it goes both ways...when she takes them out of state does she tell you where they are going, address, phone number?
I would tend to go with yes,, she gets it, just like you get it. BUT for other things like taxes, NO you dont have to give that info out. I always white out my information and the bottom number. It is not her business and our state it goes by parents only so she doesnt get my info. If you were going to a hotel, you should give her that info, BOTH parents have a right to know where there children are especially when they are taken out of state.
Give her a cell number and a hotel chain close to where you are staying...you can always say you decided to stay with family...and she had number to reach you. Next time, dont tell her until AFTER you have children so this wont be an issue and she cant deny time.