We had spoken through the years (I had gone to school with her all the way back to elementary school). Not a whole lot though. We weren't friends by any means (other than meaningless Facebook friendship where pretty much the whole school added each other)Rejoice in the fact that you received even that, GM. I'm slightly confused though:
-This broad had never spoken to you prior to this evening, then walked up to you, and said "Let's boogie!!!"
Or
-She pulled you onto the dance floor without saying a word, remained silent as you all glided around thr ball room, then walked away afterwards, still speechless?
If the latter, it's entirely possible her hyper-religious parents discovered she'd been talking to guys earlier that year, and then removed her vocal cords as punishment. In which case, her dancing with you was likely just as much an act of self-pity, as it was sympathy
The scenario was closer to the 2nd scenario you described (although I have no idea whether her family was religious)
I just looked her up. Found a LinkedIn. She still has her good looks (and is a Certified Medical Assistant)