Based on the way I phrased it, I totally see your point. What I didn't express very well, is that I always get the impression that if she were to freak out about something, that she will get very nasty, either at Floyd, or someone else. I still remember on their season the time that Floyd thought he'd lost his passport, and she really seemed like she was moments away from going completely ballistic on him. I also see little glimmers of meanness in some of her behavior.
Basically, she presents herself as being a happy, go-lucky person, and when she is happy and things are going well, she is generally fine. But if something were to go very south, I could see her getting very nasty and think that she would cut you like a bitch. It's kind of like a two-faced personality - and personally don't like people like that. If you're going to be a villain on the show, and present yourself that way, at least you're being honest about it.