Being around people and getting to know them makes us feel alive, as it gives us intense good feelings. The same goes, at least for me, for aestetically pleasing things, so depending on the museum and the interests she has, a museum can add to that. For me, fairy tales and fantasy games and such, for instance, allow my imagination to run wild, creating a more intense, colorfull and vivid image of the world, which is hence aestetically more pleasing to me, and makes me happy. I'd say our main goal is enjoyment and pleasure, therefore we're always gonna try and be happy somehow...
edit:the chocolate chips are a very small example of this, I guess. As they're different shapes, they're always original, hence making them more interesting than something that always has the same boring shape. That makes it sorta 'aestetically pleasing', I guess you could say