Sounds like she's getting a healthy diet. You might give her a little boost with some vitamins mixed with some moist feed and see if she doesn't improve significantly. Some chicks, for whatever reason, sometimes lack what it takes to get that first good start on life. This chick seems to be one of those - we've ALL had them too!all of them have purina non-medicated start&grow. i have wood shavings as substrate. she is eating on her own and i’m working on getting her to drink by herself. i’m hand feeding and watering her as well until i can be sure she’ll do it on her own. they get grubblies (dried soldier fly larvae) as treats but not very often.
For a chick that young, you could mix up a little Starter Feed, a bit of fried Egg Yolk, Water OR Yogurt (we use Yogurt because our chicks love the mixed berry flavor) and a few drops of Nutri-Drench or Poly-Vi-Sol (human baby vitamins), then stir it into a moist paste ball about the size of a marble and feed any amount of the mix that she'll consume.
This is what I'd do if she were in my care. In place of the Nutri-Drench or Poly-Vi-Sol, you could use a 1/4 table of Vitamin B-Complex crushed and pulverized to add to the mix too...
I think with a little vitamin treatment you'll see some faster improvement in her overall condition and improvement in her legs too.