Egg production problems

[Learning101]

Hi all, I need your opinion about egg production. My duck has not been producing egg for some time already. Initially it was soft shelled egg. Then I increase her intake of egg shell but it does not seem to improve. Then I just leave her as long as long as she eats and drinks. Lately, she seems lethargic, not eating much the way she should be and with swollen belly. Then I found lash eggs in the coop. Her daily intake are pellets, pumpkin seeds, brewer yeast, broccoli, tomatoes, carrot, rice, millets, crashed corn and mealworms. She’s not much of a lettuce or fermented beans eater. It’s hard to find avian vet in my area. But for the time being, can anyone suggest help? Thanks in advance