9 eggs should be fine. Glad to hear that she made the move so well. She sounds very dedicated!
To candle eggs, you can use a bright flashlight. Hold the egg with the fat end up (this is where the air cell is), and shine it into the egg, trying not to let light leak out around the edges of the flashlight. Do this in a completely dark room.
Some people never candle eggs that are put under a broody hen and some people candle them a lot. I only candle on day 10 of incubation when using a broody hen. At that mid-point of incubation, I'm looking for signs of development (blood vessels, chick movement). I remove any clear/infertile eggs and any eggs showing blood rings at that point. Check out the learning center articles on incubation, as they provide guidance on candling as well.
Assuming the eggs are all fertile, the hatch rate can be very high using a broody hen. I often get 100% hatch rates using broody hens. (hatch rate = % of fertile eggs that hatch)
To candle eggs, you can use a bright flashlight. Hold the egg with the fat end up (this is where the air cell is), and shine it into the egg, trying not to let light leak out around the edges of the flashlight. Do this in a completely dark room.
Some people never candle eggs that are put under a broody hen and some people candle them a lot. I only candle on day 10 of incubation when using a broody hen. At that mid-point of incubation, I'm looking for signs of development (blood vessels, chick movement). I remove any clear/infertile eggs and any eggs showing blood rings at that point. Check out the learning center articles on incubation, as they provide guidance on candling as well.
Assuming the eggs are all fertile, the hatch rate can be very high using a broody hen. I often get 100% hatch rates using broody hens. (hatch rate = % of fertile eggs that hatch)