I feel like my friend is trying to copy me...?

She's going to get tired of this sometime. Well, as long as no one is getting hurt, I would just laugh it off. Just be your creative, original self. She's probably just going through a phase. She sees that what you're doing is working so she copies it hoping for the same results. She just hasn't developed her own sense of style yet . . . I'm sure this can't go on forever. Remember, you're the orignator . . . you could just ask her point blank, "Hey I've noticed that you've done (see examples above) and it's what I'm doing . . . is there a reason that you're copying me and I'm just wondering why." She may open up and tell you or she may deny the whole thing . . . whatever, if she's a good friend besides trying to be your twin, just laugh it off. I'm sure this is a phase and she'll have to develop her own identity and sense of style one of these days.