-Are you going to school? She won't last a few days. The first day she will be hungry, and the next day she will break out in a cold sweat after walking a few steps.
You'd better convince her, or you can tell her that I have a similar way to lose weight during the holiday. It wasn't long before she fainted on the road. It's very hot now, and she will faint in the sun. How dangerous is it (some people say it's good to get used to it when you are hungry, but I haven't practiced it)
My suggestion is that if you are not busy with your studies, she will definitely be lazy to lose weight like this in the summer vacation. She can sleep all the time on holiday. Eat an apple when she wakes up, and then go to sleep, anyway. When I really get enough sleep, I get up and do my homework. Then I can't eat anything but apples and water.
That's how my sister lost weight, because she didn't eat when she slept, didn't know she was hungry when she slept, and ate when she was hungry. She lost almost 17J in two months. This is different from personal physique.
If she won't listen, you'd better send someone to follow her. It is dangerous for her to fall. = =