I'm sure that combing her hair wasn't that important that she couldn't wait to get to the bathroom.
On that note, I have a classmate who insists on constantly wiping his nose, then placing the offending tissue on the desk, or when at meal time, on his tray. Since the dry cold weather has started up, the whole group is subjected to a bloody/goober tissue in front of us. It has gotten to the point that I have to turn away as soon as I see him pull the tissue out. I mean, I didn't want to offend the guy, so I told him in a humorous way which most college aged males respond to better. I said in a casual joking, yet discrete way "Oh man, put that away, buddy!", and he immediately lashed out at me, saying "CALM DOWN".
With that reaction, methinks its not the first time he has been told about it. eek.