I have an edge over her now. If she decides that she wants to- once again- meddle in my business, she could very well decide to use her powers to come help the Avatar and fight against the Fire Nation. Having to dispose of her and her friends would be so inconvenient, so I've seen to it that she won't try anything of the sort- if she does, I tell everyone.

Not to mention the fact that she knows a secret of mine, too. I'm simply returning the favor- and ensuring that she won't give mine away or attempt to use it against me.