Plot summary
Fran scuffles with a woman while purchasing flowers to welcome Maxwell's mother, who is visiting. The woman later arrives at the Sheffield house, where Fran learns she is Mrs. Elizabeth Sheffield. Mrs. Sheffield annoys everyone in the house except for C.C., who immediately tells her that Fran has her eye on Maxwell. Mrs. Sheffield tells her son to fire the nanny as she assumes they are in a relationship and does not want history repeating itself like his father (addressed in season 4's "Me and Mrs. Joan"), but Maxwell proposes to Fran instead just to spite his mother. When Fran realizes the proposal is not real, she decides to toy with Maxwell and make him feel guilty for the insincere proposal.
Credits
Adapted from Wikipedia contributors, The Nanny season 3. HTML formatting and reference markers removed.