I feel like I shouldn't be guilted into sharing a collaborative study guide with a classmate
Isn't that a little rude? Why don't you want to share with your classmate?
She is a cheater and she wouldn't share the study guide with me if I needed it.
Working collaborative with others can be very difficult but when working on something together you should share. You can always let the teacher know that she is not sharing so only she will get in trouble for not sharing.
I don't care about your opinion. I only wanted to vent about her for being a cheater.
How about rethinking your plan? The expectation for the study guide was to work together and share, so you need to follow through. At least you can feel good knowing you did your part.