She is a student at North Shore High School and is in Mrs. Norbury's homeroom. She is a new student at North Shore the same year as Cady Heron. Mrs. Norbury assumed that Michigan Girl was the new student from Africa, which Mr. Duvall mentioned, but it was Cady Heron.
Michigan Girl calls Alyssa "a gap-toothed bitch." She later apologizes during the workshop in which the Junior girls make apologies to people they've hurt, as it is "not her fault she's so gap-toothed."