Until I read this article, I didn't know what gender dimorphism meant.
Yes, her eyeball actually has a wider diameter than her wrist.
Giant eyes and tiny hands symbolize femininity in Disneyland.
Click through to see some of the reference images. One could isolate Disney here, but cartoons of a variety of countries have their representational biases. For example, anime features characters with gigantic eyes and miniscule noses.
This is one area where I'd be curious to hear from some actual animators to understand intent. It's possible the daughter in The Incredibles looks a bit too anorexic relative to the other humans in the movie, but perhaps animation's natural propensity to exaggerate just amplifies existing representational tropes.