Struggling duck

[Pitsandweeners]

I have a female duck that recently is having issues walking. I have checked for foot/leg injuries and nothing seems to be wrong. And I massaged her abdomen/cloaca and cannot feel an egg or swelling. She has been using her wings to help her stand up/sit down without falling on her face. They have just gone through molt so we are offering oyster shells is there anything else I should be looking for?

 

[6BeachChicks]

@HollowOfWisps

 

[Crazy Maizie]

Oyster shells aren't really something offered for a molt. It's a source of calcium that helps strengthen eggs.

What feed is she on? What extras does she get on top of feed?
What breed of duck?
How long has this been going on?
A video would help which needs to be uploaded to a video server first (you tube, vimeo, etc).

 

[HollowOfWisps]

Just to add to the above questions, but how old is she?