Hi, I believe my friend is jealous of me. How do I deal with this situation?

Hello, so I have this really nice friend let's just call Friend #1. She is usually really friendly and funny, but for the past week, she has been leaving snide remarks out of nowhere when we have been perfectly nice to her. My friends have told me she was copying my personality, and was jealous, and that was why she has been acting differently. By copying, I mean sort of using my catchphrases, or just talking like me. Should I confront her about this, or just hope it wears out in time?