Season 3: Episode 50: The Sitter
Debra decides to hire a babysitter, so she hires Lisa. Lisa is highly recommended and is very popular with the kids she baby-sits. When Marie finds out that she wasn't asked to baby-sit, she feels insulted. But Debra gets a taste of what Marie's feeling when the kids prefer Lisa to her. So Debra lets Lisa go and asks Marie to baby-sit. Marie however can't handle the energy the kids have and trips over a toy and hurts herself. So Ray tries to get Lisa to come back but she's already found another job at the Parkers.