I've got two sixth years...

Mischa - fellow housemate and dormmate, thye know each other that uch can be deduced. Now, Mischa isn't who tends to love being the certian of attention, so she won't be one to steal it from Cookie. I'm not exactly sure whether, they would be friends. Although she's very open to pretty much everyone, she may want to keep her distance from Cookie just because of the spotlight. She's got plenty when she's in an embarrassing moment, which is pretty much once a day.

Kayt - both she and Cookie would probably know each other from Potions and Transfiguration class as those are the only two courses they have together. She doesn't flirt that much with guys, prefering to befriend them than to date them. She's got a big mouth, and really I'm not sure whether Cookie and her would get along or simply be acquaintance. Right now I'm leaning more on the acquiantance though.

Ya know where to get me, so let me know what you think.