Whoo! 16 pages and still going! Is she a Dancer?

Yes
+Her dress is, perhaps, a telling hint
+The hint dropped during the Posing Rangers event
+She's "dancing" when we first see her
+She seems to be utilizing kicks more than punches -- perhaps a DNC's main mode of attack?
+A blade at the end of her ribbon

No
-Her "dance" is not a "dance," but a martial arts form*
-She uses MNK abilities in the teaser
-Her arm blade is a MNK weapon
-She's rumored to be Yda, who is a Pugilist (or MNK)
-Ala Mhigo is likely a homeland for monks

*I practice martial arts, and I, as well as anyone else who practices martial arts, I assume, do not see myself as a "dancer" when I practice a slow-moving form; therefore, I don't treat it like a dance.