Erin is a girl who vacationed to Little Pwagmattasquarmsettport with her family.
While there, she met Lisa Simpson, whose family was also on vacation and had the intention of making new friends and leaving her nerdy self back in Springfield. By acting like her brother Bart, Lisa immediately clicked with them and takes them skateboarding at the library. Bart discovered she's acting like him and decided to try to steal her friends. He showed them Lisa's yearbook (which has all of Lisa's nerdy accomplishments) and Lisa, assuming they won't like her any more, runs off crying. However, Erin and the group realized that Lisa is a good person and they glue shells on the family car that say "Lisa Rules". They also signed her yearbook.
Erin is friends with Ben, Dean, and Rick and enjoys skateboarding. Her favorite show is Baywatch.