If they are added on different days they will not all hatch at the same time. She may stay on the nest for a day or so after the first ones hatch - any that hatch in that time are fine - the ones that don't will probably be abandoned - even if they are good and have live chicks growing in them. She will care for the ones that are already hatched because they will be needing food and water. You can put them in the bator and try to finish hatching them, but it might be tricky if you don't know which ones were laid what days and how far along they are in development. I suggest marking the ones she has now somehow and removing any new ones daily - they will not be marked so you can tell the difference and not collect any eggs that she has been sitting.
