Please Help Chicken won't Stand at all!!

Hello. I just rescued a poultry chicken from the chicken house. I brought him/her home. The chicken didn't look quit right but i brought it home, cleaned it up and put it in a box with clean towels. I put a little king syrupin water and gave it to the chicken. It drank the water and started to look a lot better so i hard boiled and egg and grinded it with the shell. The chicken ate a good bit and has been drinking plenty of plain water and eating very well. She looks perfectly healthy and poop is what i read it should be. Problem is the chicken has not stood or even tried. I just picked her up in the palm of my hand and let her legs hang and did a simple range of motio and everything seems fine. One foot will slightly curl the toes when i push the leg up and rub the toes, unfortunately the other leg and toes will do nothing.
Can anyone give me advise as i know nothing about chickens I'm just trying to do the right thing.
I read a checklist on a chicken exam and everything seems to be in order with the exception of feathers missing on the underside and sides under wings.
Please remember this is a poultry chicken so its not very old and has been eating stuff made to make it grow fast.
I rescued a total of five and their heads are still slightly yellow.
Please can anyone tell me how to get the poor things legs working.

 

Not a layer they come in as babies and stay till they go to the slaughter house. What kind of therapy should i do?
Btw thank u so much for responding so quickly

 

I want to do everything i can because she is not sick as she is eating and drinking beautifuly and she's bright eyed and she flaps her wing ever so often so i know she has a good chance. Do you think she might staighten out when the crap hormones get out of her. She and the others are a little bit small that why they didn't go i think.

 

Do i get the vitamin b at a health food store and how do i administer? I have tried to give pieces of grapes and cucumbers but she won't eat those all she wants is the hard boiled egg with shell. I read the egg was an excellent source of nutrition.

 

Thank you there is some great advice here. I have been working extensivly with her this morning massaging her legs and doing some range of motion. I have notice that in the nonfuctioning leg she is able to slightly pull it back at the hip but no fuction in the toes. I have built a sling attached to a human walker. This was to try and put her in a standing position taking the weight off the legs and I'm hoping she will sometime soon pull her legs up. Does this sound like a good idea or am i hurting her more and should take her out?