Panel 2: April, STOP snorting that Ritalin. The dogs look more irritated at her than excited at the prospect of Elly's return.
Panel 3: WTF? Is April playing a joke, or just utterly clueless? For cryin' out loud, Elly's glasses flew off!
Panel 4: Ha ha...ha. ETA: Okay, in light of others' comments, I'm changing my assessment to "WTG, April! That'll show Elly for dissing you on your return home/first week of high school!" In fact, that's probably precisely why she did this: she wanted to give Elly an "enthusiastic" reception because she herself didn't get any reception at all!
So that's it. And tomorrow will be the Mary Worth-style summation: "Well, I was in jail, and I found another suitor for Liz! Radio sucks, and I ran over a possum!"