Lisa's School of Dance

My daughter loved it their until she started to get bullied by one of the other students. I tried brining it up to the dancing instructor and was told they have had complains of this other girl rolling her eyes, saying nasty remarks, and making fun of the other students from other parents. All i was told to do was to ignore it well ignoring hasnt stopped by daughter from getting bullied while at dance class, and she still gets pick on, and she been saying now she doesn't want to go because of this mean girl and apparently they spoke to her parents which hasnt done nothing, so where does the line get drawn, Lisa's School of Dance!!!!