Is my friend copying me? If so, what should I do?

You should tell her that you think that maybe she acts a lot like you, and that it's good to be your own person. If she denies you saying that you think she copies you give her the examples you gave in the post. Most importantly try to be CALM. No one likes to be told they are a copycat and feel like they are being attacked. If all else fails stop hanging out with her. Her style will either sink or swim without you.