Does a girl sin if she wears short clothes in front of other girls? And do those who marry her or cohabit with her sin if she does not respond to advice?

There is no harm for a woman in wearing short clothes in front of other women, as long as they cover what is between the navel and the knee. The awrah of a woman in relation to another woman is like the awrah of a man in relation to another man, meaning what is between the navel and the knee.