Usually with a riboflavin deficiency, they can get curled under toes, and gradually may become lame. Paralysis can be caused by a stuck egg pressing against the sciatic leg nerves, a spinal injury, and Mareks disease.
Here is some reading about Mareks disease:
http://csu-cvmbs.colostate.edu/Documents/vdl-mareks-disease-fact-sheet.pdf
https://www.backyardchickens.com/articles/the-great-big-giant-mareks-disease-faq.66077/
I am sorry. Can she still move her wings and neck? Did you feel for a stuck egg? I would make sure that she can reach food and water, or you will need to feed her several times a day. If you lose her or put her down, it would be good to get a necdopsy and testing by your state vet. Here is a...
Is the lameness in one leg or both? This sounds gross, but if you or your parent could insert a clean or gloved finger inside her vent 1-2 inches, to feel for a stuck egg, that would be helpful. Since she laid a soft egg recently, I would give her a 1/2 calcium tablet or Tums orally now. Has...