Why was girl behind Hermione crying after the Yule Ball?

Was watching Goblet of Fire, and noticed this wierd thing. We all know why Hermione was upset, but what happened to the girl behind her on the staircase? I first thought it was one of the twins, but that's not the case. Was she just really distraught about Ron-Hermione relationship like the rest of us? Lol

P.S.: Sorry for bad quality pic, but Max wouldn't let me screenshot it.