Don't let it bother you, seriously. You know who you are. What does it matter if some lovely person is talking sh*t? It doesn't. Just remember that you're happy with you and you'll be able to hold your head high while she's forever looking at the piles of sh*t she's buried herself in.
Jeez, she (uh, he? She? Idek?) sounds absolutely horrible. If she's threatening you, you could probably report her if you needed to. Defend yourself too. Don't let her get away with anything serious.
Ignore her. If she, he, whatever, is going to be immature about it, then don't let it get to you. You are who you are and no one has a right to change that, no one does. So be who you want, and be it proudly.
Stand for yourself, and don't let someone bring you down merely because they're seemingly uncomfortable with who they are, so they find it right to bully or emotionally harass people who are more confident than them.
Don't let it bother you, seriously. You know who you are. What does it matter if some lovely person is talking sh*t? It doesn't. Just remember that you're happy with you and you'll be able to hold your head high while she's forever looking at the piles of sh*t she's buried herself in.