My master left, and my commission was paid this month, but hers was not. I worked with her on a project.

This problem is very difficult to do, no matter what you do, you will be unfaithful to one party! In my opinion, can you do this? Whether you are your master or not, you should be partial! Tell her the truth! Tell her again not to betray you, because you still have to work here, let her solve this matter by herself (you don't think your master will betray you), and give your commission money to your master as her share! Make a dedication, and your master didn't teach you once for nothing! Money is a thing apart! Let your share of the money be returned to your master!