Should I tell her mother?

[bored2lyf]

I suggest talking to the girl and finding out exactly whats going on. At this age, kids start being able to handle themselves, or at least appreciate being given the opportunity. Immediately involving her mother could cause her to resent you and the girl she was bullying. This, of course, would not help anything. If she seems unwilling to explain or alter her behavior, then tell her mother, but express to her the delicacy a situation like this. Many parents do not know how to treat their children with a true respect- only that false thing that yells and makes demands, all while insisting that it's for their own good. Children, especially competent ones, must be treated as though they are, in fact, competent. I would advise, no matter what you decide, delicacy.