(Strip Number 1264, Original Publication Date, 15 March 1988)
Panel 1: A little while later, a smiling Lizzie tells Mike that she got that loose tooth out at last. Mike tells her 'Way to go!' because he digs this.
Panel 2: The reason for that is that now, she can eat peas one at a time without having to open her mouth and she can fire off spitballs without waiting to reload.
Panel 3: This triggers Elly's "My Mother Will Magically Materialize To Chastise Me For Failure" sense which causes her to teleport into the room and scream "That's enough!!"
Panel 4: She continues to be pissed at him when he asks what's wrong with giving Lizzie the benefit of his experience.
Summary: What we have here is the other factor that makes Elly's life worse. Her default belief that all she has to do is assume that other people are too stupid to be like her and do right in order to explain why they do things that bother her is made worse by her assumption that there's a big, stupid conspiracy consisting of everyone else ever dedicated to making her miserable.