AITJ for refusing to share my notes with a coursemate who missed lectures because she chose to travel?

There's a girl in my course, i'll call her A, who i'm friendly with but not close to. We sit near each other sometimes, exchange the occasional message about deadlines, that kind of thing. Earlier this semester she went on a two week trip during term time, not a family emergency, not anything urgent, just a holiday she'd planned. She missed four lectures and a seminar.

When she got back she messaged asking if she could have my notes from the sessions she'd missed. I said no. Not harshly, i just said i wasn't comfortable sharing them and suggested she reach out to the lecturer for any materials posted online and maybe ask someone she was closer to.

She seemed surprised and said she thought we helped each other out. i said i didn't mind helping with things like checking over work or explaining something confusing, but handing over notes from lectures she'd chosen to skip felt different to me. She went quiet and i heard through someone else that she'd described me as unhelpful.

My flatmate thinks i was a bit harsh and that notes aren't that big a deal. Maybe. But i spent time in those lectures and afterward writing up what i'd heard, and i don't think choosing to travel during term and then expecting someone else's academic work to cover the gap is really on. i don't know, maybe i'm being rigid about it. AITJ?