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Annibelle, created by Dorothy Urfer, was a comic strip that seemed to care more about its look and feel than its actual content. The jokes, as they were, generally centered around the social lives of women and how they appear to each other in society, and the gossip about other women in their social circles. These tended to be women on the upper crust of society, whose lives were not particularly relatable to the general public. Still, the artwork by Urfer, and later by Virginia Krausmann, was some of the best on the newspaper page. The women and their lives looked glamorous and exciting, so it didn't matter that what they talked about was vapid and uninteresting, and even though it may be a life you would never have it was a way to dream about having it.
This particular strip is a good example of the gossipy nature of the humor. The joke doesn't necessarily seem to be that Annibelle finished all her shopping early, but her cat messed up her handmade sweater, so she has to go buy her brother something at the last minute. It seems to matter more that her friend caught her shopping at the last minute and will probably tell all of her friends that Annibelle bragged about being so smart, but it turns out she's just like the rest of us and was putting up a front. How embarrassing!