I'm close; Elly is baffled by something Lizzie did,
Panel 1: As our story begins, we find Lizzie reaching to grab a toy cowboy on a toy horse.
Panel 2: She wraps her hand around the cowboy and picks up the toy with a cheerful "Gah!!"
Panel 3: She next yells "Horsey!!!"
Panel 4: As she makes thing go up and down, she says "Horsey go donga-donga-donga-donga"
Panel 5: She starts donga-ing towards a potted plant.
Panel 6: She dongas the toy into the pot.
Panel 7: She dongas merrily away in the potting soil.
Panel 8: Having had a lot of fun pretending to have the toy horsey run in the woods , Lizzie takes it out and leaves little tiny hoof prints on the carpet.
Panel 9: Elly shows up after Liz leaves the room, sees the toy with its trail of potting soil behind it and wonders how the tracks got on the floor.
Summary: I'd like to think that she's trying to figure out which kid did it but knowing her, she probably thought that the toy did so on its own. She's not very bright, after all.