How to Deal with a Bitch for a Coworker

I've been working for a week and a day now... Training with three other people, two of them being of the male gender. The first day went really well. The other girl and I went to lunch... Expressed how nice it'd be to have a friend at work. ...And I can't decide if her sentiments were genuine, or if she was just conniving from the beginning.

But the next day brought on a rain of passive-aggressive, catty-ass behavior. Hit me like a brick.

Only thing I can chalk it up to is the primitive womanly instinct to compete. Perhaps she feels threatened. Perhaps she's pms'ing. Perhaps she's just a bitch.

My point of this thread, because she's not worth much more of the strain on my fingertips, is... The way to deal with a bitch for a coworker is to put her in her place one time, to make her aware that you are capable of pushing back.

Then to sit back and watch her spin her wheels. Her issues are obviously with herself... Might as well appreciate their entertainment value.