The bulgarian girl

I'm working at a relatively small restaurant. There really isn't a lot to do, because most things we serve are pre-made, so we just have to take them out of the freezer and heat them up. My boss there is a bulgarian girl. She's a really nice and smart person. However, I want to kill her. She's really anal about the most stupidest things in the building, so she's always bothering us about the way cups and silverware are put in the front counter, or if we put one extra slice of pepperoni on a pizza, but them when we have a lot of people waiting in line, we always run out of food because she's not fast enough when cooking. I always try to help her, but she has such a high concept of ehrself, that she thinks she's the only one that can make things go well. She's so narcissist, that nomatter what we're talking about, she starts talking about how she's so perfectionist, and how she has an "innate ability for doing things rapidly", or how her senses are always overstimulated, so she can hear or see when somebody is talking about her.
I also work with other guy from Ecuador I met last year. He's really fun, and he always makes us laugh with his jokes, which helps a lot to deal with the long hours at work. We are always laughing at the bulgarian girl in spanish, so she can't understand what we talk about her.
But tragedy occured when her best friend told a friend of mine she took an intensive class of spanish so she could understand what people from Ecuador and Colombia talked about on her back. Of course, she didn't tell anyone but her bulgarian friends. After I heard that, I almost had a seizure when I started thinking about all the shit I've said in front of her. The next day after I heard it, I could barely look at her face. So I started acting like I never knew anything, and now I only make jokes about her to my close friends, and only when I know she's not around.