When I first saw the perf, I actually said "Ow!" out loud... looked like it really hurt. At first I thought maybe she blacked out for a sec or something, but after a bunch of replays, it's pretty obvious she just mis-stepped, probably cause of her high heels? Regardless, it's great that she was super professional about it. She didn't make a noise when she fell, and she got up and performed even harder. I also like how Gyuri seemed to be worried about her.
I hope she's ok!