chicken waddling with tail to the ground

[Chiknsrcool]

one of our chickens has suddenly started waddling with her tail to the ground. she is eating fine but the is slow and her friends are taking a dust bath right now and she would usually join them but she is sitting off to the side. does anyone know what’s wrong with her and what I can do to help? Is she in pain?

 

[Wyorp Rock]

When was her last egg?

I'd give her extra Calcium and see if that helps.
You can find Calcium Citrate with D3 in the vitamin aisle of stores like Walmart, CVS, etc. Give 1 tablet daily, just pull down on her wattles, pop the tablet into the beak and let her swallow.