And that is what matters! It sounds like a wonderful place you have and all the rescues have a wonderful home full of love.
That is why BYC is so special we can come on here and talk about all our feathered and furry babies and no one thinks we're crazy.
You are feeding them good and yes meal worms are a big treat here. I found Nutri drench at Tractor supply and you can order on line. Just remember treats for meal worms and crickets and worms [unless of course they are finding them themselves] and nutrient dense feed as main course.
Your TLC...
But is she getting the calcium she needs to lay her eggs? Hopefully the blood work will tell whats going on.
Ducks need a good amount of calcium to lay . Layer feed and Oyster shell offered in a separate bowl is most of the time enough but even then some females need extra so alot of us keep...
Over weight ducks can have problems laying so it will be a good thing to have her checked out.
please let us know what the vet says. and Welcome to BYC @PollitolovesPio
Sounds like with the one you picked up that can happen we push on the belly and crop area and water/food comes back up and stress can make it happen too. As long as they are eating good and acting healthy other wise. Just keep a closer eye on them to make sure it doesn't keep happening...