Panel 1: We see her lay down the law to him; if he's rude to her one more time, he's gotta spend the rest of the day in his room without supper.
Panel 2: He responds to this ultimatum by, of course, blowing a raspberry.
Panel 3: Angered by a predictable outcome, she carries out her threat.
Panel 4: She then thought-bubbles how they always cross lines she didn't want to draw. That's right. She's moaning about having to stick to her guns, the wavering git.
Summary: We've switched from her not foreseeing the obvious to her whining about how horrible it is that she has to be a parent. A lateral shift in total failure, at best.
ETA: I remember that this time last year, we were angered that Lynn was wasting time on another exercise in pointless martyrdom: Shannon's sermon on the cafeteria table.
ETA2: It's Liz's birthday today. Check out her squick-inducing banner and despair!