She'd get in trouble in Musketeers' Paris. Something would happen that she'd find unjust, she'd make a big scene and suddenly she'd be wanted for arrest. :/
Also his reason for having certain abilities is super cute.
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She'd he the avatar because main heroine pureblood. PFFT
But no more seriously hmm... that's a hard one. I'd say airbender due to her affinity with butterflies (my sole reason) but she loves meat, and while she claims to be a pacifist she wont hesitate to kill if there's no other way. That said she'd avoid it like crazy if possible, and even lectures Zero because he is more likely to kill than take in for questioning. Verses Yuuki who would restrain and then bring in for trial.
I'll go with water bender, since VK land is a cold climate, she has a lot of history with snow (lame reasons) and I think the hardy and determined attitude that they seem to have would fit her best.