Aahhh…family and scheduling. I can relate to this. A casual get-together can turn into months of scheduling and re-scheduling. I have 3 kids (6, 10, 12), and it is impossible to find the “right” time. What I have found is that I’m fairly spontaneous. I prefer not making plans, and only getting together with family or friends if we find that we are actually free tomorrow. But we do plan, and I’m ok with people cancelling. Things happen. But I never cancel my plans to try to schedule something else. In your case, I would keep my plans with your daughter’s friends and mom. But that’s just me.