Usually young chicks do have to figure out how to walk. However, at 2 or 3 days they should be moving more than fine. I would pick her up and look at her legs. Check for broken bones, but be very gentle.
The balance issue would be due to moving around on one leg. If you can't see any apparent reason for her leg tucking- or if you do see a broken bone- you can splint it. Be careful, though, and immediately remove it if it's not helping by one or two weeks. I suspect it may be a fracture.
Here is a good thread on splinting:
https://www.backyardchickens.com/threads/how-to-treat-a-broken-leg.659231/
I also suggest using a cotton ball under those toes on that second leg, IF the issue doesn't resolve when the tucked leg improves. Tape it to the bottom of the foot, gently- it might help spread those toes. You don't want to tape the toes together, or leave them immobile (ie, using a band-aid), but instead provide soft, comfortable support while still allowing mobility (blood flow), and individual toe movement. Do this only if the problem doesn't improve, the tucked leg is more important.
Be aware that when the chicken is older- IF it is a fracture and IF you do solve the problem, splint or otherwise- it may have a limp, but should be healthy! Good luck.
I have a 2 day old silkie/sizzle chick that seems to have something wrong with one or maybe both legs and feet. One foot is some what curled up and it holds the leg up next to its body. Haven’t seen it put weight on it or extend the leg. The other leg extends fine but it’s foot seems sort of weak like it can’t keep its toes spread and balance right. It moves around but has trouble and falls down sometimes. Any idea what this might be or what to try to help it? I have vitamin additive in water but not sure if it’s drinking much at this point. It does eat a mush of crumble and water with the vitamins in it. Was thinking maybe band aid truck on the weak toes but what about the other side?
