I don't know what it is, but I couldn't stand her when she was introduced. There was something wholly unlikeable about her.
That being said, the show is doing such a better job at making characters likeable than the movies. I think she should die, and I'll be kind of disappointed if she doesn't. It would be a really REALLY good turning point. Even better, I think, then Padme's "Well, I'm done!" death.