Maybe you want to try if tube feeding will help her to recover: https://www.backyardchickens.com/threads/need-to-tube-severely-molting-hen.1437023/So she made it through the night but she’s not able to walk and now she won’t eat the mash. Her crop is empty. I’m afraid she’s thirsty or hungry and that’s part of what’s causing her weakness.
Or maybe it is just that her time has come.