What do I do about her?

There is this girl named Ariel DePaul who is bothering me alot and saying stuff i dont wanna hear! She is one of those blonde popular barbie dolls that make fun of people who aren't like them. When i wear something shes like " that blue doesnt go with that blue" or " you're not supposed wear solids wwith pin stripes. She ALWAYS comes up with something bad to say about my outfits! I am sooo tired of it and I dont know what to do to stop her. She is basically taking over my life! HELP!!!