I actually asked her and her femfriend from our company would they dance with me(i just wanted to pick someone whom i knew better and lightweight). Femfriend said that she already picked pair, and she said that she want to pick someone from another class. Then my classmate wanted to dance with her, she said she isn't against it, but at that evening we all went for a walk and she asked "so, did you find pair?" and we decided to dance together. It's just that i was the best from the worst, imo, and maybe it's because she knew me.
I wish i went with another girl, who asked me before, but i wasn't sure at that time will i actually dance at all