Sorry for your loss, and glad she is not suffering. Let us know how the chicks get along. Do you have a heat source and brooder until you can see if the hen accepts them?
It depends on how old the chicks are. I have added baby chicks to a broody who only hatched one chick successfully. But there is a chance they could be pecked and attacked. I have placed one at a time under the hen, but I would advise you to be present to make sure they are getting attacked. You...