Mareks disease could be a possibility, but I would treat with B vitamins just in case there could be a vitamin deficiency. Do you have a rooster who could have hurt her back, or high roosts where she may have hurt a hip or leg? Are her toes curled under?
Can you make sure that she is near food and water, and perhaps try a chicken sling to get her upright? Here is a homemade chicken sling where foood and water are placed within reach:
Make sure the vitamins contain B2 (riboflavin,) since riboflavin deficiency can cause sitting back on hocks. I would get some human B complex tablets and crush 1/4 to 1/2 tablet onto some feed or a treat daily. Nutritional yeast would be another that you could use, that has B vitamins. Here is an article about B2 deficiency, and below is a pic of a chick with riboflavin deficiency: http://www.thepoultrysite.com/publications/6/diseases-of-poultry/217/vitamin-b2-deficiency/
went to the store to get vitamins and when i returned the chick was standing up, a little wobbly, but trying to move around. I read that Markek's disease could cause temporary paralysis so i guess this could still be the case...
I would read the label on the vitamins to make sure they contain riboflavin. It is worth a try to treat her for a couple of weeks with the vitamins to see improvement. Pictures are sometimes helpful to see how they are standing. Hopefully, it is not Mareks, but this can be a common age for symptoms to show. Check the date on your grower feed to make sure it is fresh. A small amount of chopped liver is very rich in riboflavin and other B vitamins. Good luck.
the chick is standing/walking at about 75% normal this morning..I am wondering if i need to keep her separated from my other chickens? She is in an isolation cage right now, but i assume that whatever she has has already been exposed to the others. I should note that my other two chickens are much older (about 2yrs).