Sally Ayerson was a young girl who was in the same school as Nikki McGinley and Dory McGinley in the Season 2 episode The Mistake. She is an unseen character.
Because the McGinley's are wearing homemade dresses, they are afraid Sally, who got hers at a high-end department store, will make fun of them. Their mother Kayla McGinley threatens to "key" her father's car if they do.