What would you to with your co-worker?

I have to deal with a snarky, rude, evil, sarcastic b of a coworker everyday and been doing it for the past 10 years. It's hard to do. I would just ask her privately if you have upset her...more than likely she'll say nooo...she's just an office bully. I have to ignore and just keep coming up here for the paycheck. Good luck.