First of all, if she goes out for a part-time job in the afternoon and doesn't eat, she is really hungry at night and can't help ordering a midnight snack.

Secondly, the prices in the cities where she goes to college are very high, such as Beijing and Shanghai. 19 yuan may be a cheaper snack in their place. She is really hungry.

However, if she 19 yuan ordered a midnight snack to take out, or wanted to eat it, it's ok to eat it once. If she eats too much, it's extravagance.

It all depends in the end. Don't accuse her of extravagance as soon as you go up.