Can you get close up pics? Beautiful avatar ! egg shells do give some extra calcium but honestly oyster shell is the best, but I will always keep on hand Calcium Gluconate after losing a duck to being egg bound.
With her already having some problems we have found the best an quickest way of dealing with a nutritional imbalance is to get the DURVET vitamin BComplex TSC carries it and it will say injectable but we give it orally. You can put it over a treat they usually gobble it down an full dose would...
If there isn’t anything outward then possibly. Wouldn’t hurt to have her inside anyway to make sure she is eating drinking and also to see how her poop looks a pic of poop would Be a good idea too. If egg bound a good warm soak is a good idea.