Definitely don't take the babies away from her! She will keep them warm (and she earned those chicks).
Mama hens are the experts at raising little ones, you will be amazed to see how fast the chicks progress compared to those kept in a brooder. The babies are also so very quiet and content when sleeping under a real live hen.
Thank-You so much for your advice. What your telling me is what I am experiencing. She is just a pullet I got this winter and seems to know what she is doing.
I put a nice box out where she is and maybe she will go in with chicks this P/M. It started raining again.I hope when the chicks are ready she will return to the pen/coop. There are 6 but I couldn't get all in pics- some always hiding.