(Strip Number 142, Original Publication Date, 15 June 1981)
Panel 1: We start off watching Elly carry Lizzie in a backpack; since the little girl is two years old and getting fairly heavy, Elly is clearly in pain as evidenced by the sweat drops coming off her and that her tongue is hanging out.
Panel 2: She puts the pack down and struggles to take Lizzie out.
Panel 3: Lizzie is mildly confused by the fact that Elly is bent over and has pain stars coming out of her bottom; she'd also be confused by Elly's narrowed eyes of rage.
Panel 4: As the dander emanates from her scalp, Elly tells Lizzie that she's officially too old for the backpack.
Summary: The problem, of course, is that Lizzie IS two and doesn't understand that she's too heavy to carry; this will come into play tomorrow when Elly refuses to do so only to pick her up anyway, all the while muttering about how Lizzie is trying to oppress her.