2 more days

Two more days and counting. I have a BO that went broody and I bought eggs and placed them under her. I can't stand the wait. You folks know what I mean. What can I expect with the broody? Will she sit till all are hatched or get off the nest and watch? Her brooding cage is 2x3x8 and is enclosed in a covered run. To the right of the cage is the coop and to the left is a screen door that leads to the outside run then a door to freedom. We are experiencing a cool down and temps are in the 50's in the morning. I am starting to worry if the cool down will hurt the new chicks. Do you guys think it is too cool for the hen to be hatching this time of year? I could gather up the chicks and put them in a heated brooder if I have to. I was hoping to watch the hen interact with the newborns. Then again here I go counting my chicks before I hatch. John