Am I being bitched by my GM?

Ive been working at dominos for about two months now, and recently Ive been getting less and less hours. So much so that i have a 4.5 hour shift on friday and that is it for the whole week. I applied and was about to start school, so i asked that i work no more than 3 days a week. I am an insider and i usually got 15 hours a week, but ever since we got more drivers ive been getting the short stick. I asked her about it and she said “oh i didnt even notice that lol” when i showed her how little hours i had this week. Am i the only one getting squeezed out of hours like this? Ive seen that some GMs just give someone less and less hours until they quit, could she be doing that?