Is she still sitting then? At this point she should be out raising the chicks she already has, or did you decide to take them away?
It's been pretty cold her for the last few days so she's kept her chicks underneath her almost all the time. I do see the older one occasionally. Yesterday was finally a little warmer so I managed to push her off the nest to see what was going on. She now has 3 chicks total and no more eggs. 2 of the chicks are just a few days old so still pretty small and fragile. I'll give them a few more days and then I'll move the water and food out a little farther to encourage them to come out of the crate into the larger chick pen.
We did that last year and currently have a broody hens raising four chicks. We live in the mountains of south west Virginia where it's cool. Abby, our broody hen is keeping her chicks warm. At the same time the chicks are adapting to the cooler temperature. We have a heat lamp in their outdoor nursery but they don't use it much. The nursery is attached to the main chicken run so the current flock can see mamma and her chicks. We will mix the baby chicks with the main flock when the chicks are a month old.
Good idea about the heat lamp. I had hoped it would be warm enough not to have to do that but it is still April in upstate NY so still have some pretty cool days. I'll get a heat lamp in there today.
). And last night was the first time they went up into the enclosed coop with the rest of the flock and left their brooding pen behind. Overall a great experience!! Thanks for all the great advice. 
