Mrs. Applebaum was Cory Baxter's elementary school teacher.
After Mr. Grozowtski lost Raven's original career test scores, she was placed as a teacher and forced to go help with Mrs. Applebaum's class. Later at home, Victor, Tanya and Chelsea listened to Raven and Cory's contradictory statements about what happened.
Larry came over and explained what really happened. Mrs. Applebaum left the room because she was having an allergic reaction to her mascara and everything else that happened was accidental.