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She may have a systemic infection - or there could be a problem with her reproductive system that is now developing.
If you could get her to a good duck vet that would be best.
Giving her time in lukewarm water deep enough to float in, under supervision may help.
Pekins can go through growth spurts that make it difficult for them to carry their own weight. So I would help her get off her legs as much as possible. Perhaps you could build a sling for her.
You could take a fecal sample to a vet's office and have them check for parasites.