Panel 1: Elly stands there horrified because her voice is totally gone and she cannot say a thing. Since she doesn't admit that she's rightly seen as a kill-joy and a scold, she won't see the inevitable joke about a vacation from her angry yapping coming.
Panel 2: She looks through one of the medical textbooks to find out what to do about her laryngitis. The book says to rest her vocal cords completely because even whispering is a strain.
Panel 3: This horrifies her because the kids will be home soon. What is she to do now that she cannot speak? How is she to communicate?
When one remembers that what she wants to communicate is the fact that she can never be pleased and that everything they do is wrong because they're bad children who hate her and want to see her suffer, one can see the punchline coming a mile away.
Panel 4: She slumps down in a chair so she can gloomily thought-bubble that it doesn't make a difference because they don't listen to her anyway.
Summary: Since Elly lacks self-awareness, she doesn't admit that most of the reason for that is that all they ever hear is a non-stop stream of angry bluster about how they hate her and want to destroy her because they have free will.