How long has this been going on for? Has it been since you got her? Do you know if she can put any weight on her leg at all? What is her brooder like, like does it have shavings, straw, or newspaper for bedding? Do you have anything she can jump up on or anything she could get her foot stuck on (like hairs, strings, wires, etc)?
Gently run a finger and thumb along her leg starting at her thigh and ending at her foot. Do the same to her other leg to note any differences. Do you feel any swelling, specifically around her joints? Completely clean her foot and try to keep it clean at all times. (You can use a warm damp cloth to clean her foot from anything that might be caked on.) Examine her foot and toes carefully and check for any swelling. (Also, if possible, can you provide a close up picture of her leg and foot?)
If possible, it would be ideal to keep her off her feet for a few days. Using a *chicken chair would be best. For a simple leg injury, it should start to improve after three days and being close to full improvment at two weeks if it's not fully improved.
If you can't get her in a chicken chair, keep her in a space where the surface is completely flat so she can't trip over anything (so no shavings or straw) and where there is nothing that she can jump up onto. Try to keep her area as clean as possible and keep her feet clean as dirty feet (even when cleaned once a day) isn't healthy and can be part of the problem.
*Links to possible chicken chairs that you can create:
Post in thread 'Versions of "chick chairs" PLEASE!'
https://www.backyardchickens.com/threads/versions-of-chick-chairs-please.1166308/post-18356950
Post in thread '20-month Silkie can't walk, one leg seems fine'
https://www.backyardchickens.com/th...walk-one-leg-seems-fine.1603148/post-27282099