She's also in pretty much every episode of Flight of the Conchords.
For people interested~
So the woman who voices Mabel was on a morning radio show in my city yesterday doing an interview, and it was kind of awesome. She's hilarious!
Kristen Schaal is the best!
Everyone should check out Season 6-7 of 30 Rock, and Bob’s Burgers if they want to see or hear more of her.