Tsak and Bruk did not get along. It was actually because of a fight between the two that caused Tsak to get lost (they had argued and she got pissed and flew off then got lost in the mist). That said, I'd Imagine most character, like any party, will find some reason to blame themselves. 

After her initial thought of "I left you idiots alone for five minutes...", she's going to have her own guilt of getting lost and not being there to help.