What thing you can do is stop letting her go to her Mom's when she isn't happy. Your time with them is your time.
I get that you want to see them both every day. Parents should want that. However, you just told her do this or this is her only option. She picked opposite of what you wanted. Give her a few days of after school care and by then she may have worked it out for herself. This might also give you a well deserved break. Then you may might find yourself not getting so upset with her.
Give yourself a break. You are a great dad.
kat
Me-53(and learning!) S24, S21, D18, D17 Just keep swimming, Just keep swimming. Dory