I have a coworker who I was close friends with before I started working there and I grew up with this girl. She has a fiance, a kid, her own house, we never were romantically involved never will be. 

Here's the deal, she has been causing conflicts at work saying that I have made snide or mean comments to her. This isn't in text or any real hard evidence beyond hearsay but I assure you it's untrue. The problem is she doesn't come to me (her supposed best friend) and tell me. She goes to my supervisor who we are both very close friends with and he tries to play referree to a fight that shouldn't even be taking place.

I'm up for a promotion in a couple weeks, she has been starting a conflict and I haven't spoken to her in person, texted her, facebooked, send her any communication whatsoever in over a month since I got with my new girlfriend. The supervisor keeps covering for her saying that "She didn't say anything... this is what i observed" when there was nothing to observe and when she finally came to me about the issue she said verbatim what he said to me the night before after work.

How do I deal with this and get my ex-friend/coworker to shut up and stop trying to cause drama for no reason and get me in trouble with my boss?
user
version: A coworker who is female that i was close to many years ago but am not now is trying to cause a
assistant
I have a coworker who I was close friends with before I started working there and I grew up with this girl. She has a fiance, a kid, her own house, we never were romantically involved never will be. 

Here's the deal, she has been causing conflicts at work saying that I have made snide or mean comments to her. This isn't in text or any real hard evidence beyond hearsay but I assure you it's untrue. The problem is she doesn't come to me (her supposed best friend) and tell me. She goes to my supervisor who we are both very close friends with and he tries to play referree to a fight that shouldn't even be taking place.

I'm up for a promotion in a couple weeks, she has been starting a conflict and I haven't spoken to her in person, texted her, facebooked, send her any communication whatsoever in over a month since I got with my new girlfriend. The supervisor keeps covering for her saying that "She didn't say anything... this is what i observed" when there was nothing to observe and when she finally came to me about the issue she said verbatim what he said to me the night before after work.

How do I deal with this and get my ex-friend/coworker to shut up and stop trying to cause drama for no reason and get me in trouble with my boss?
user
Ex-friend is causing workplace drama trying to take me down and I don't mean to be a dick to her but she won't
assistant