Panel 1: We find ourselves at the lake shore today. This is so we can watch Elly sitting on her beach towel with a wrap over her swimsuit waiting for something. As she does so, we watch her watch a slender woman in a bikini walk by.
Panel 2: She continues to wait as another slender woman in a swimsuit walks by.
Panel 3: Next, comes a rather hefty lady walking by not caring especially about her weight.
Panel 4: Since she is no longer the fattest person on the beach, Elly takes off her oversized T-shirt and walks down the beach showing off her physique.
Summary: This tells me that if no one fatter than she is walked by, Elly would have wasted the whole day feeling sorry for herself and being angry at confident, happy women.