I am a first time reader and I see some warning bells with Isabella. At first she seems like a great friend, but then she starts to seem a bit too flirty with men. The scene where she pretends not to care about 2 strange men and then follows them is funny but also a bit disturbing. At that point, I thought, well, maybe she is fundamentally nice but a little boy-crazy. I have friends like that. But then at the dance when she first promised Catherine she wouldn't dance without her, then almost immediately abandoned Catherine, sent a warning bell. It is one thing to be a bit flirty - it is another thing to break your promise to a friend. Maybe she just got too excited and lost a sense of propriety, but then again it isn't her first ball. She ought to know better by now.