Q: Passage: Kristen Joy Schaal (/ ʃɑːl /; born January 24, 1978) is an American actress, voice actress, comedian and writer. She is best known for her roles of Mel in Flight of the Conchords, the over-sexed nurse Hurshe Heartshe on The Heart, She Holler, Louise Belcher in Bob's Burgers, Mabel Pines in Gravity Falls, and Carol in The Last Man on Earth.

Question: Based on this passage, who plays mabel's voice on gravity falls?
Let's give stream of consciousness below

The important part for answering this question is: She is best known for her roles of Mel in Flight of the Conchords, the over-sexed nurse Hurshe Heartshe on The Heart, She Holler, Louise Belcher in Bob's Burgers, Mabel Pines in Gravity Falls, and Carol in The Last Man on Earth. So the answer is Kristen Joy Schaal.