azula is definitely going to be pretty bitter, even more-so than she may be now, especially after katara kills her. this place pisses her the fuck off, man :| plus not being able to go home after TEN YEARS will definitely take it's toll. she may be a little more on-edge and a little "crazier", but her screws won't exactly be loose since she would have managed to befriend suki during that time

she's still trying to be friendly, after all, that wouldn't have changed much because she knows the value of company in a place that makes you miserable
so i think she'd definitely want to keep kanaya around, especially since they get along pretty well

however you want that to develop....