She may very well be broody and you will want to put her in broody jail. Before doing that remove her in the morning. Put her in the run after checking her over for any signs of illness or injury. Observe, does she walk funny? Does she eat and drink? Does she poop and is it normal? If all seems well continue to keep an eye on her to see if she runs back to the nest. @aart usually says to wait 3 days to see if she’s serious about being broody or does she give it up. Meanwhile keep taking her out of the nest. She needs to eat and drink.