They go thru 2-3 molts, called juvenile molts) between hatch and about 6 months old.It's a small molt before they get a full fledged molt. I may be wrong but I've been seeing a lot of her feathers in the coop. I hate that shes going through it right now because we are freezing today but it is what it is. I believe they go through 2 mini molts before they go through the big one.
Sometimes older pullets will have a partial molt their first fall/winter, usually just around the neck.
First full adult molt happens their second fall/winter.