Pre-School teacher needing some answers

I have been teaching pre-school for 7 years now. I am concerned about a little girl in my class. I have caught her many times luring boys into the bathroom, and on one occasion i caught her w/ her pants down and asking a special needs boy to kiss her down there. Today i caught her under a table and telling a little boy "show me your weinee and i will suck it" She is a very out going little girl and seems to be very happy. I have spoken w/ both mom and dad about my concerns and both parent (who are divorced) became upset w/ me and said that she is picking it up here at school. Like i have said I have been teaching for awhile now and i have seen children exposing themselves, masterbating, and using alot of bathroom words. I have never ran across a child this provocative before. She is not shy, and at times She if very demanding and oppositional. As you can see she really doesn't have any of the symptoms of a child suffering from sexual abuse. But, at the same time i am at a loss at what to do. Please help.

This girl does not adhere to the norms which our society regards as adequate for her age.

Ask the parents to take her to a child psychotherapist to get an examination to find out what is behind her maladaptive behavior, and whether it can be treated.

It is serious that she does not stop on demand.