A.B.
At this age they are feeling eachother out. My son would have playdates he was dying to have and either he wanted to do something different or the friend did. Sometimes they play seperate sometimes together. I never interfere unless there is an argument. It's part of socializing, being in a new space and getting to know eachothers likes and dislikes. By tomorrow your daughter is gonna want to have her back, always happens with my son.