As students, we don't have much money. It is human nature to be a little short of money, but it depends on where and for whom.
For example, if classmates can't afford to go out to eat together, then AA. Don't always give yourself various reasons for not paying, trying to take advantage of others.
Anyway, I will feel particularly uncomfortable through what she has done. I will try not to have anything to do with her in money in the future, and I will hide if I can.