So you want the more accurate umpires (on average) in AAA? Makes sense.
I believe in her 1st game behind the dish, she was 13th of 15th umpires, so there will be games where she out performs the ML umpires, but over the long run, you'd expect she's near, if not at the bottom of the list.
You should also consider there may be an early adjustment period with nerves and other factors involved for any umpire who's new to the major leagues.
But you're going to do you - so I'll move on.