I found the clip (the rest of it)
Seems like she got composed and did the rest of the routine like normal. TBH I think she thought it was going to be lipsync and thus didnt try. Then went a bit oh **** wtf when she realized she made a total fool of herself.
But its okay, its Sooyoung. I love her
I also love how they don't really care about the routine at the end there. Cuteee