I am trying to think of possibilities.
Being eggbound can cause them to walk oddly sometimes. A quick overview of treatment for that is bath, extra calcium, possibly anti-inflammatory and antibiotics (one of our ducks was eggbound last week).
Botulism, a toxin, can cause them to walk like...
can you upload a photo or video? what breed is she? age?
Been laying?
I would get her into a tub of lukewarm water, let her float, and watch her closely.