Haven't you got anything more important to worry about? Lucky you!
Seriously though, why do you mind? Because other people comment? Because it's different from what you're used to? There's nothing actually wrong with going around in bare feet, is there. Problems might arise with cold or with sharp objects, but in principle there's nothing wrong with it. Most of us wear shoes to protect our feet from the cold and from hard surfaces but in many places it's (a) not cold and (b) the surfaces people walk on are softer than tarmac and concrete. In both cases, the need to wear shoes is not there and it's definitely better for feet not to be cramped in shoes.
If I were a betting person, I'd bet that the little girl will want to wear shoes when she's older, just to be fashionable. Time will tell. Meanwhile, why worry if it's not doing her any harm?