Because she has neither declined nor improved, I would try just immune-supporting nutritional therapy with her much as chickenzoo has suggested.
For one week do this daily - reevaluate with us at the end of one week:
- 1/2 crushed B-complex tablet in a wet-treat or on watermelon.
- 1 E oil capsule (400 to 700 IU) - slit the end of the capsule and empty into her mouth
- Polyvisol baby vitamins without iron - 3 drops in the beak daily (I find these in the vitamin section, not baby section, of walmart, cvs, or other drug stores)
As for her food, it's a good food. Since her comb is growing, I would offer oyster shell free choice. She can begin to receive laying feed up to one month before laying to build upt he calcium and supportive vitamin D for calcium absorbtion. Laying hens should always receive free choice oyster shells (versus egg shells which aren't as absorbant into the blood as far as calcium goes).
Make sure the feed is very fresh - in date, the bag looks good and no sign of humidity, the feed is used within 1 month, and it's kept in a dry,. cool, airtight container. It should also be changed daily - refreshed of course.
If you want to eliminate the possibility that she got into some sort of mildew or mold or soured feed, you could do a one time gentle flush to possibly flush any toxins from her digestive tract and give her a fresh clean slate for good bacteria. Let me know if you're interested in this approach.
The vitamin therapy is not a quick-fix. Often if there is any element of nutrition involved in the problem, it was long-standing. Thus the repair process is also longstanding.
The vitamin E is both for inflammatory processes (in case something is inflammed an impairing her muscles or nerves), as well as neurological healing (in case she was injured or exposed to something that caused neurological impairment). It's also full of anti-oxidants that help with healing and immune function.
The vitamin B complex includes a range of vitamins in one capsule. Vitamins B are often implicated in problems with ambulation (walking) as well as paralysis issues. I would check the toes of that effected foot carefully - see if when the foot is relaxed if the toes curl at all inwards, or are relaxed and semi-curved.
The polyvisol is a relatively medium spectrum balance of vitamins (mainly oil vitamins and B) that are a good over-all immune booster as well as spot treating oil vitamin deficiencies if she had any exposure to mildew/molds and thus mycotoxicosis. Mycotoxins (the toxins from fungus and mildew) cause oil vitamin deficiency so, without a blood test, we're going to conservatively treat for it and at least build her immunity if there's NO deficiency. She can use the extra help. I believe in direct-fed vitamins rather than water for oil vitamins because they're more effective, less light exposure (thus less degradation), and honestly - we're talking oil vitamins, not water-type vitamins. Oil vitamins in food, water vitamins in water.