OP mentioned earlier that eggs were being broken. For this reason I wouldn't suggest keeping the eggs in the nest. This could lead to the chickens becoming egg eaters, a hard habit to break. Alternatively, collect your eggs daily, write the dates as suggested, for about 3 days. If your pullets is new at laying you may find she will increase her egg production over time. Collect your marked eggs in an egg carton but NOT in the refrigerator. Keep them somewhere safe. After those first 3 days start removing the oldest eggs and adding the eggs of that days gathering. Put the oldest eggs in the fridge for eating. Now you're not only collecting possible eggs for hatching, you're still collecting edible eggs. Putting the oldest eggs in the fridge makes sure you know which ones you can eat. No eating the newest eggs from the box in the cupboard. When you are positive you have a broody pop those eggs under her along with whatever eggs she collected that day. Just make sure to mark every single egg she now has under her. After that day you need to check for new eggs and collect them for eating. Don't leave eggs under her that weren't under her the day you put them there. If they aren't marked remove them. Her eggs are all on the same timetable for a hatch date and you dont want eggs undrr her that will hatch at a different date. She will abandon those to take care of her hatched chicks.
