I'm sorry she's not getting better. I'm not sure how to help, I always take my ducks to the vet.
Were you able to get the calcium into her? They don't cooperate, so you have to really gently pry open their bills and stick the syringe to one side of their the back of their mouths. Some people wrap them up in a towel first so they don't wiggle as much.
You might find it easier to give her a tablet, but you'd still have to open up her bill and slide it down one side of her throat.
If you can put it over mealworms that would be the easiest!!