She played:
AM woman in "(I Love You) More or Less"
AM woman in "Al's Alphabet Garage/'J' Won't Jump"
Prunella the Grouch in an episode from Season 24
AM cow in "Achoo" song
some dog opera singer from a show in Season 27
She actually has a wonderful voice when she sings. I think she may have actually appeared on the show herself at some point. There's this episode from Season 24 where Oscar is on the Sally Messy Yuckael show, and Oscar ended up with a kitty cat, and I think Pam was the woman who came to get her cat, but I'm not positive. It was a muppeteer, though.