What is this?

Anytime I say I'm going to do something this chick does it first. Say I'm dying my hair? She does it that night the same color and with my usual hair cut. Say I'm pricing something? She does it that night. She even copies my style of clothing! I've told her multiple times to stop and to leave me alone and just stay away from me but she KEEPS following me around everywhere! If she sees me talking to my friends she'll barge in and try to talk with us or just stand next to me creepily. Shes done this to all my friends as well and they are super uncomfortable with her too and have asked her to stop before as well. What is this? Should I report it?