Panel 1: The answer is Elly herself. We see her and John in bed after a long day of mutual stupidity. She states that now that she's over thirty, she's decided to be objective about her looks. Yeah. I know. I can't stop laughing either.
Panel 2: She asks him the loaded question of how he would rate her looks.
Panel 3: She aggressively prompts him for the wrong answer to her question.
Panel 4: Realizing that there is no right answer, our boy says that if she thinks she can trap him that way, she's got another think coming.
Hypothesis 1: As big a jerk as John was, Elly had her moments of cloddishness too. Her path to failure was and is the manufacture of artificial crises.
Hypothesis 2: When Elly rants about the sacrifices she made, she's really talking about she grew old and fat because she was a housewife. Anyone who says she lost her looks because of her toxic attitude, piss-poor diet and refusal to exercise is not being fair.
ETA: In my local paper, they accidentally ran this Saturday's strip. It's filled with anvilly goodness.