@Lilliwyt No, it's definitely the girls who brought her and put her there. They claim they have not enough people to make it even, and she naturally assumes that there is a girl missing, so reluctantly goes along to make for even pairings. But they deliberately "trap" her being uneven the other way around - there's not enough guys ... so they put her with them, as planned.
And then they flirt with her, of course.