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The problem with new eggs coming into the nest is that you'll end up with staggered hatches. If they're staggered by more than a few days she'll need to leave the nest to take care of the poults that are running around, so the developing embryos will die. Ideally, the original eggs are placed in the nest all at the same time, and should be marked with a circle around the middle (so the mark can be seen with the egg in any position). The nest should be checked daily or every other day, and any new (unmarked) eggs should be removed. That is especially important if she's starting to get a large number of eggs under her. If she ever gets too many to cover properly, the eggs on the edge will get too cold and die. As she shifts the eggs around, more and more will take their turn on the edge, so those will die also. So staggered hatches, and large numbers of eggs under a broody, can end with very poor hatch rates. If she's a first time broody then nine eggs is probably her max, although 6-8 is more manageable for a first-timer. If you want her to brood them, then I would mark all of them now, before any more get added by other hens (they like laying in a communal nest, and a broody will take in all eggs available). Then check daily and remove any new eggs. Since her eggs were started on many different days, her hatch will be staggered. You'll need to watch very carefully when the first poults start to hatch. Once she leaves the nest to take care of the poults, you'll need to quickly put any remaining eggs into the incubator/hatcher to keep the near-term embryos from dying.
Very exciting!!
