Panel 1: She doesn't do so today. It's a John and Mike mess-up. We see John in the shower stall silently cursing.
Panel 2: He leans out of the bathroom door and bellows "Who took the [expletive deleted] soap?"
[Note: It's entirely possible that there actually is lots of soap in the bathroom. The problem is that the obsessive-compulsive dipshit wouldn't use it because 'sink' soap cannot be used in the shower.]
Panel 3: This causes Mike, who was passing by, to freeze for a second.
Panel 4: He then tells a frustrated John that he, who avoids soap, is the last person to ask.
Hypothesis 1: Lynn is just selecting strips at random to "prove" that family life sucks but we have to endure it to demonstrate our worth as people. A bad person like Therese may cut and run and escape to sanity but a good person like Elly must burn away everything that made her worth knowing to enter into the charmed circle of people Lynn approves of.
Hypothesis 2: She's making us nostalgic for the Settlepocalypse.