just remember that your crush is transient but anything you do to realise it may have more permanent consequences.

if you do ever interact with this girl, you should be careful it is as an adult being friendly with a child, not as a girl-lover living out his fantasy.

if you really want a friendship with a little girl, and who here doesn't, i think its better to find a candidate inside your own circle of friends or family, and to try being a little open (without revealing everything) about your enjoying the company of children.