The Legru Corridor - Sword Art Online Episode 19 Reaction

I still don't understand why she thinks kirito was so mean to klein. I know she took how he acted to klein the wrong way, in that she thought he was annoyed or something whenever he saw him when he was actually feeling guilty, but I would have thought she would notice there was something wrong with that assumption by now. especially after all the times that klein said stuff like "that's still bothering you?" and such.