A duck is not a human child. You can't reason with it. You can't tell her that you're coming back, as far as she knows, you're gone forever! She's all alone, so I'm the only "flock" she has. Leaving her alone to cry and cry and stress herself out is kinda cruel. She may even resort to feather pulling or other self-mutilation if I do just leave her behind for 8 hours a day. I do my chores with her by my side, I took her to the vet office when I did my internship, and I don't intend to stop until I know she can be left alone safely.
As I said we DO plan to get her a buddy, but since the breeding season is over we gotta wait to reserve a duckling or buy an egg. We need to get a call duck, and a baby one, to A) imprint, and B) ensure that it'll be okay being raised in a home environment. There are tons of adults for sale right now, but none are indoor ducks, and I can't in good faith force one to live inside, just as I'd never force a house duck to suddenly live outside.