Not trying to start something here but I would say something about that to your ex. It is part of your keeping your boundaries. Just say you already had plans for them on Sunday since it is your day but the rest of the time(if it is indeed hers) is fine.
I had to call my ex on that last year planning a trip with them on my time/weekend without even asking about my plans. got to get these people to think.
kat
Me-53(and learning!) S24, S21, D18, D17 Just keep swimming, Just keep swimming. Dory