Also, consider that she still may be molting. Some will take longer, and they may not show as much feather loss at one time, except maybe loss of tail feathers. Some hens who molt in the fall may take a break until the first of the year before resuming. My older hens do that. But since she is in her first year, she should start laying sooner. Watch to see if she is eating and drinking well.
Look her body over for mites or lice, and some mites only come on late at night, so checking in the dark with a headlamp whicle she is on the roost may help. Mites will suck blood making them pale and anemic. There should be mite dirt or specks on brown on her skin if she has those. This might be a good time to worm her and the others with Valbazen 1/2 ml orally and then repeat it in 10 days. Shake it well before drawing up the liquid suspension. Don’t eat her eggs until 14 days until after Valbazen.