Can you see/tell what is wrong? Sore/infection, sprained ankle/foot? (i.e. any obvious tenderness if you touch near/around any joints? Any redness or swelling anywhere? Any limit to what she will allow if you check her ROM?
I'm hoping it is a simple sprain/twist that will gradually get better with time. Will she stay in a sling if you make one for her?
@Kris5902 has a great pic of a sling she has made/
FYI: I've found, for my chickens, they don't stay in the sling well unless they are really sick/badly injured. However, orps
tend to be a bit more easy going and Rose might be compliant. though not sure on that since she doesn't seem to like a foot soak, and many of mine have really enjoyed the warm epsom salts soak...and will frequently sit for 20 min...or more (mainly until the water cools!)
Hope she feels better soon and is up & running around