This school!

My sister dyed her hair red. She want to school Monday and was asked to go see if the color was ok for her to have. She got 3 days of iss and given the weekend to dye her hair back. Her teacher asked why they gave my sister iss and not the girls who have braids in their hair(colors like red,blue,purple). They told her teacher because the girls with braids could take them out(but they don't make them take them out). Also their are girls with her color hair that are not in trouble! What would y'all do? I also have a picture of my sister's hair