New coworker

My store got a new co-worker. She isn't new to the company, but she is new to the store. The problem is she came into the store like she runs the place. Most of the people have worked with the company for longer than she has, but she is coming off like she is the boss. I try to get along with everybody but it makes it really hard, when I have been with the company for 9 years longer than her. She has made a lot of people mad and no one wants to work with her.