Try it and see! You never know it may work.I was thinking of just wrapping the toe kind of like you do for curled toes on chicks. It straightens out mostly but I can feel her pulling it back closed. She has been scratching around in the garden but she is using the top of her foot. Even if she can't walk properly on her leg if her toes are open it will make things alot more comfortable for her.
Oh...let's think for a minute. They do make bird booties too! Someone else had a hen with toes that curled under, the bootie helped her walk.
One is for chickens, the other is for ducks. If you are crafty, you may be able to fashion one yourself too

https://www.amazon.com/Birdy-Bootie...8&qid=1546919850&sr=8-1&keywords=bird+booties