Hiiiiiiiiiiiiiiii! Yes! KATHERINE!! She's a bitchy as she comes and then some. Don't worry too much about spoilers, this is a place to have fun and if I run into one, then it's my own fault. I chose this. It's okay, you're fine on the slang, all is good.
We have to have these two run into each other at some point. Katherine is from around the middle of season 3 so she doesn't know about the whole Elena bitchy vampire thing. I imagine it'll be more like looking into a mirror than never with the whole vampire thing they share now. :)