The simplest solution is just call it "Info/Dancing". This would allow her to make info rolls to recognize important dance performers, identify styles/moves/steps/music types, contact a professional dance instructor, and in a pinch do "The Robot" without looking like a complete spaz.
However, you'd essentially be rolling Intelligence checks for all those, which kind of makes sense if you don't want to equate dancing with pure physical abilities. Even the most agile ninja might have two left feet when it comes to tripping the light fantastic, while a clumsy nerd might be able to tear him up on the dance floor.
However, it sounds like you might prefer something based on Dex/Agility or Charisma. In which case, I'd probably suggest looking at Bryant Durrell's "Entertainer" archetype and use the "Entertainment" skill, which is Charisma-based: