Then I would start her on vitamins and see if she improves.
Give her 400IU Vitamin E and 1/4 tablet B-Complex daily. A treat of egg will help with the uptake of E.
See that she's eating her normal feed.
Hopefully she will start to get better.
So she tested + for Giardia?
Poultry Cell can be added to the water to give a bit of a boost, but you need to provide a station with fresh plain water too.
Did you ever give her direct oral vitamins as suggested on the other thread? The B-Complex and Vitamin E?
Same hen from your December thread?
https://www.backyardchickens.com/threads/chicken-one-eye-closed-and-lethargic-please-help.1607640/post-27396015
If so, then no, not likely Curled Toe Paralysis, especially if you've been feeding her a nutritionally balanced poultry feed and had given her...