What to do when an ex friend copies your personality and interests?

[HarryPotterFanatic]

I was friends with this girl a year or two ago, and we fell out real bad. We got over the fight but we both moved on and made different groups of friends. This girl in particular though still has some sort of grudge against me, I try not to connect with her over social media in fear that fights will start again, however one website she has managed to find me on she tends to stalk what I'm doing/ my interests. All of a sudden she's listing all these people I adore as people she adores, and all of a sudden has the exact same interests as me, it's very odd. And these aren't mainstream people I adore either, so it's obviously the fact that I like them. She won't admit that she found out about these people through me, even though it's obvious she has. It's really bugging me, what should I do?