Retirement episode
It's the last episode Florence Halop was in. The episode was their efforts to keep her from having to retire.
A line is stuck in my head: Flo says, "I have to stay alive to keep you lot in line!" The issue wasn't about keeping her alive. It was about keeping her working beside them.
I'm convinced she misspoke, but they left it in as she said it because of her death. Considering no one was talking about her dying up to that point, when she said it, it was really jarring.