So my duck layed an egg last night however in the afternoon I saw yolk in her pen, I don't think the egg shells are breaking in her but their's just a failure to produce an egg shell.
I am defiantly keeping a close eye on her, nothing in her poop it all looks normal with no shell pieces in it. Thank you and everyone for the information and help.
The food I give her is waterfowl maintenance diet extruded floating. I checked this morning and an egg was in the nest but I'm going ahead and ordering the oyster shell and poultry drench just to make sure.