Did you notice that Noirin already knew that Angel had her hairbrush, but she couldn't just have a quiet word with her, no, no, no, a good opportunity to get Angel up for eviction here. So she pretends that she has lost it, by shouting it out as loud as she can, and when she gets to Angel she picks up her brush and says "Hey, everyone. Has anybody seen my hairbrush, it looks just like this one!!!"
Angel might have been absent-mindedly innocent... maybe or maybe not. But Noirin didn't have to do that. No wonder Angel was up for nomination. What a cow.