AITA for not letting my friend copy my notes anymore after she told me I was too "obsessive" about studying?

The way I handle school is very well (20F). It helps me learn better when I take detailed notes for all of my classes. Since the beginning of the semester, my friend "Emily" (20F) has been taking my notes because she misses a lot of class and says she has trouble keeping up. At first, I didn't mind because I thought I was helping her, but lately it feels like I'm the only one benefiting.

Emily told our group last week that I "overdo it" with my notes and that I'm "obsessive" about learning. I felt pretty bad about myself as everyone laughed. I told her that was rude, especially since she was the one who was getting something out of my "obsessive" notes. She laughed and told me to calm down because it was only a joke.

After that, I told her she could no longer borrow my notes. This week, she asked for them, and I told her no and told her why. She pushed back, telling me I was taking the joke too seriously and that it wasn't a big deal. Some of our friends think I was too angry and that I should still help her because she "needs it."

AITA for cutting her off from my notes after what she said?