Paralyzed Legs- vitamin deficiency??

Hi,
About a week and a half ago one of our 3 year old barred rock hen became paralyzed. Prior to this she had lost a lot of weight due to complications with a sour/impacted crop. She began limping around at first and then within a day or two completely lost the use of her legs. At first we suspected Mareks however since her condition has not worsened and none of the other chickens are showing symptoms we are thinking a possible vitamin deficiency? Has anyone else had to deal with this problem? It seems as though one of her legs is regaining strength although very slowly. As I mentioned she has been completely paralyzed for about a week and a half. I'm wondering if anyone can give me an idea on how long it could take her to recover or if shell recover at all? We are very close with her and would like to avoid euthanasia if at all possible. Chicken vets are not readily available in my area so we've been trying to deal with this on our own.
Thank you for any help or tips you can share with me!