Thanks for your suggestion @CntBoy777! She had gotten herself wedged between a box and a board next to our workshop. DH was in that area calling her and listening. He didn't hear her chirping/calling back, but every time he called, he could hear her rustling. It turned out she had wedged herself into a tiny space, that she couldn't back out of. DH looked, but didn't see any eggs. He shoved a 2x4 into the space, so no other birds could get caught in there.
DH took her straight to the barn and put her in our convalescent stall with plenty of hay, food and water. We will check on her in the morning and will likely put her back with the flock at that time.
That could have turned out so bad....and sad. What a happy day! It reminds me of the parable of the lost lamb. Even though the shepherd had 99 lambs, counted and safe, he went out to find the lost lamb. Celebration!
She didn't eat much overnight, but did drink some water. She did seem to have some energy, so we decided she needed to be back with the other birds for some social time. She fit right in when we put her back.