The girl probably has issues in her own life and is taking it out on your sister

Omg you are so lucky to get into that school go you

Once the files are added to the zip folder your also adding information about the files so they can be removed.

Yep

Everything is toxic if you eat too much of it

If your asking the question you already know the answer, at this point your looking for confirmation the choice you are making is the right one.