We have an Orpingtin hen, I believe she was hatched in february, who has suddenly decided to turn broody. Last night when we checked on her she had four eggs, she roamed outside with the rest of the flock most of the day and I just noticed she has returned to the nest box and now has at least six eggs. Should I let her sit on them? Is she spending too much time off of them to hatch them? And, we're going to have some super cold nights coming up but our coop does have heat lamp, is it possible she could pull off a winter brood of chicks?