When she talks we start laughing ‘cause we’ve started to use the perspective of SNL skits. She’s a combination of two of them.
There’s Ernestine (Lily Tomlin, the operator) with her annoying nasal tone (who could listen to THAT for four years?!). And the skits of the drab monotone NPR chicks, Ana Gasteyer and Rachel Dratch.
Also, she has a basic body language “tell” a lot of the time, shaking or nodding her head. We’ve noticed a few times when she’s been blatantly lying, at the same time her head is shaking “No”, and it’s not subtle in any way.