Claudia described Betsy as a "friendly looking girl with brown hair."
Betsy orders several of her jokes through McBuzz's Mail Order and Squirmy's House of Tricks 'n' Jokes, until her parents make her quit.
Betsy loves to play practical jokes on people, even though not everyone finds them funny. Because of this, she goes through several baby-sitters prior to Claudia working with her in #19 Claudia and the Bad Joke.
Claudia was her first babysitter from the Babysitters Club.
Betsy put a plastic fly in a dribble glass of apple juice that Claudia drank. Her room is filled with practical joke things. Claudia broke her leg as a result of one of Betsy's jokes where Betsy intentionally had Claudia swing on a broken swing (although Betsy had not anticipated the broken leg and was horrified). This accident caused Claudia to reassess whether or not baby-sitting was for her.
Other members of the BSC also baby-sit for Betsy, and they get playful revenge for Claudia's leg by playing jokes on Betsy. She is made to see the light when Kristy, after being prepped by Sam, embarrasses Betsy with a trick at the theater.
When she auditions for the play in Claudia and the First Thanksgiving, her voice is clear and carries well. She wins the lead role in their play as Alice in Alice and the Pilgrims.