The alt text is for explaining what people would see in that image when the image doesn’t display/load or in general are unable to see it (e.g. blind people)
Perhaps mom is afraid that her daughter is going blind? I dunno.
Annoyingly, while Jerboa has a field to add alt text to the submission when you create it, I can’t find a way to get it to show me the alt text on a submission that has already been created.