Why does my young hen squat down?

Good morning, all! Of my 4 young hens, the one who started laying eggs last week, seems to startle easily and does this strange squat down with her wings slightly spread. Is she scared of me now? None of the others do this. They are generally quite accepting of me walking around in their coop, cleaning, etc. They don't really like to be picked up, but once I do, they are fairly tolerant. So I'm not sure why Paula is acting this way. Is she OK?