Here is some info on the calcium gluconate.
https://www.backyardchickens.com/threads/calcium-gluconate-for-egg-bound-ducks-preliminary.959537/#post-14940303
I'd def ask the vet about it.
The vet didn’t give her a shot of calcium gluconate? Which helps cause contractions and helps her lay? 1 ml daily or a couple times a day till she lays? Boy you 2 have really been through it! A member had one of her Indian Runners get egg bound she took her to an avian vet who gave her the shot...