Deidre was the manager of a clothing store where Brenda Walsh worked. At first, she seemed friendly, but she soon revealed herself to be a snob when she coldy kicked Santa Claus out of her store on two different occasions.
Diedre expressed dissatisfaction with Brenda's sales ability to her mother, Cindy Walsh. She began showing Brenda how to manipulate people into buying things, ending up changing her to the point where she got David Silverto buy some expensive perfume for Donna Martin.
Deidre later started stealing Brenda's sales to raise her commission to the point where Cindy decided to get back at her by pretending to be a customer and then scolding her for the way she treated her employees.