I would not personally put the hatching eggs in the fridge. Is there any reason why you are wanting to keep them longer?
If there are not too many, I would be inclined to give them all to Snowball since she is obviously committed and seems to have a good natural instinct since she was so keen to get back to her old nest.
There is not a problem with the nest being a few feet up as long as they cannot fall out before the broody is ready to leave the nest with them when all viable eggs have hatched...within a day or two of the first chick hatching. Chicks that fall out whilst the broody is still trying to hatch eggs will not be able to get back on their own and the broody will stay with the majority of chicks and eggs in the nest. The broody will encourage them to jump down when she is ready to quit the nest once all the eggs that are viable have hatched and a few feet is nothing for a chick, assuming there is some bedding on the floor to cushion the landing. I have heard of them hatching in a barn loft and dropping 10+feet and just bouncing and being fine. You might want to pack around the sides of your nest box with something so that chicks cannot fall down the gap and get stuck. They sometimes climb about on the broody and can fall over the side and into a gap like that and then chill because they can't get back in. Some blocks of wood or even just pack it with cardboard to fill that area would be a good idea. Is the wire mesh small enough to prevent a chick falling through or getting stuck?
If there are not too many, I would be inclined to give them all to Snowball since she is obviously committed and seems to have a good natural instinct since she was so keen to get back to her old nest.
There is not a problem with the nest being a few feet up as long as they cannot fall out before the broody is ready to leave the nest with them when all viable eggs have hatched...within a day or two of the first chick hatching. Chicks that fall out whilst the broody is still trying to hatch eggs will not be able to get back on their own and the broody will stay with the majority of chicks and eggs in the nest. The broody will encourage them to jump down when she is ready to quit the nest once all the eggs that are viable have hatched and a few feet is nothing for a chick, assuming there is some bedding on the floor to cushion the landing. I have heard of them hatching in a barn loft and dropping 10+feet and just bouncing and being fine. You might want to pack around the sides of your nest box with something so that chicks cannot fall down the gap and get stuck. They sometimes climb about on the broody and can fall over the side and into a gap like that and then chill because they can't get back in. Some blocks of wood or even just pack it with cardboard to fill that area would be a good idea. Is the wire mesh small enough to prevent a chick falling through or getting stuck?