Polly is the inspector for UCI.
While waiting at the airport in "The Diamond Castle", Steve greets her and offers to take her to the hotel when Frank, who usually does such, is away. Polly notes that she and Frank usually do enjoyable activities together and, in a passive-aggressive tone, causing Steve to submit to her desires. Her passive-aggressiveness later causes Steve to do things he won't normally do just to appease her, which escalates to literal cat-fights. When the evaluation ends with her witnessing the Dean's aggressive teaching methods, Steve is surprised to see that she gave them a passing grade. From Frank, he also learns that it wasn't true passive-aggressiveness that she had and that she'll let UCI pass simply because her job as inspector is to get away from her husband.