when dealing with family it is often hard to set boundaries and stick to them. If your Mom expects to see you everyday your off then why not set a boundary of .... Hey Mom "im off next X day how about we do something then...

If she wants more time simple tell her that you have things you need to attend too and you need to find balance in your life and you appreciate her understanding that...

Often when we thank a person in advance for understanding it kind of throws them off and it can help the other person to pause..

Boundaries are hard for sue but they are not impossible.

Good luck