Also, sunshine is how they get vitamin D into their little bodies. If she hasn't been outside much, she may need that vitamin boost.
And in case you haven't seen it happen before, when in jusssst the right light & in jusssst the right position, a chicken will get this glassed-over look in their eyes, stiffen up, kinda fall onto one side, stretch out a wing, maybe even fluff out their feathers & lie there soaking up the sunshine & vitamin D. Just go with it & stand guard quietly until she pops out of her trance.
It's heart stopping if you're not expecting it & don't know that's a thing, then hilarious every time after that. Morning sun, afternoon sun, evening sun....I've seen it happen at different times during the day.
Had a beautiful Barred Rock roo once who puffed himself out like a Lionfish flopped over & stayed like that throughout his sun bake, feathers all standing on end. He was magnificent anyway & that was the most incredible & interesting thing I ever saw him do...and he was a very sweet & amazing gentleman, so that's saying something!