Oh yeah... I meant to say this earlier and then forgot. Regarding adding chicks together... maybe it would be a better idea to take away the ones she has (mark them) every day, but leave several in the nest overnight for her until your eggs arrive in the mail. At that point, either incubate the ones that are a day or two or even the same day as the shipped eggs or let her incubate the shipped ones. She's a cochin so hopefully that means she'll be a good mama. If you have chicks that are 5 days old when the others hatch, they may not adjust to a broody hen well (some might) but its likely that they will be afraid of her and stay away when she is trying to mother them and warm them and then you have the issue of cold chicks... or worse.
If you have some kind of a box or pan (dish pan) that will fit into the nest space she is using, moving her will be fairly easy. If its not already in the nest box, you can make even a short cardboard box to fit, have it ready once its dark. Someone's help is a plus. Lift her off her nest, get the eggs into the cardboard box that already has nesting material in it, put all of that into the nest box so it doesn't wobble and put her back on the eggs. As far as moving her, you could probably do it at night. Learn her routine. Generally, they will get off the nest every couple of days to eat, stretch, drink and then get right back on. Usually, this brief exercise takes 5-10 minutes (at least with my birds). If you catch her on the day that she gets off the nest, then move the whole box with her and the eggs in it that night, she should move fine. What I've done to move them when required is make it so they cannot get out of the nest for 24 hours and they adjust well. The next night, do whatever you need to do to allow her to get off the nest. She'll wake up in the morning and see her new area and be unalarmed because her nest is still her nest and she has adjusted to the sounds coming from the new directions.
Hope that makes sense.
If you have some kind of a box or pan (dish pan) that will fit into the nest space she is using, moving her will be fairly easy. If its not already in the nest box, you can make even a short cardboard box to fit, have it ready once its dark. Someone's help is a plus. Lift her off her nest, get the eggs into the cardboard box that already has nesting material in it, put all of that into the nest box so it doesn't wobble and put her back on the eggs. As far as moving her, you could probably do it at night. Learn her routine. Generally, they will get off the nest every couple of days to eat, stretch, drink and then get right back on. Usually, this brief exercise takes 5-10 minutes (at least with my birds). If you catch her on the day that she gets off the nest, then move the whole box with her and the eggs in it that night, she should move fine. What I've done to move them when required is make it so they cannot get out of the nest for 24 hours and they adjust well. The next night, do whatever you need to do to allow her to get off the nest. She'll wake up in the morning and see her new area and be unalarmed because her nest is still her nest and she has adjusted to the sounds coming from the new directions.
Hope that makes sense.