Burying them is very typical she get them out once she is ready .
First time duck mamas i like to keep the clutch small like 8 and under mine usually get 6 or less. Once they go full blown broody you can go in and remove as many eggs as you want her to have she will be so into it she won't care as long as she still has some.
Once she is really broody I would def move her to her own space she'll go back to the original nest some till she gets her bearing on where you move her but she will be better off especially when ducklings hatch they will be safer. I usually keep close watch for 2-3 days after I move one to make sure she goes to her new nest. I have also waited till 2-3 days before hatch and moved mine then too. I just keep her closed up after that move. Since it would be lock down anyway. Keep water and food close by and room enough she can get out and poop so she keeps her nest clean.
Just be careful, momma ducks can be a bit nutters! In my personal experience, I have moved ducks, nests and eggs. It has never worked out. I'm quite sure that it has worked for others, but it didn't for me.