It may take a while for her to gain her strength back but putting her food and water close by will help. If it isn't extremely hot there can you try moistening her feed some with warm water to see if that helps with her eating add a little apple cider vinegar to the water before mixing it in the feed and just do a small amount to see if she will eat it. Sometimes when they don't feel well moistening the food helps. The ACV will help keep the food from going bad if it isn't too hot. Just keep it out of the sun.UPDATE:
She looks like stronger, but still her movements are weird. She stands on two legs then she try to do a walk and then she crash, but fast she stand up again and try to do a walk and crash again.
This way she is moving pretty much around all my big backyard and interesting thing is that all ducks are slowly moving around her.
So now i just will visti her trough the day and put food and water under her nose. Because she moves away from food and water.