Pumping schedule suggestions please

Im ebf, but will be going to school in the fall and my mom will be watching her. My schedule looks like this (days and times ill be gone:

Monday & wednesday: 5:30 pm-9:30 pm

Thursday: 5:30-10:20pm

Saturday: 8:30 am- 1:20 pm

I have a small freezer stash (25 oz) that I made a couple months back, my daughter is almost 5 months. How should i go about this? Should pump before class and leave that in the fridge for her? I wont be able to pump during those times so i hope that my supply wont drop too much. Any suggestions would be very much appreciated!