There are a few amazing threads here on your situation..... 1) The one detail I found VERY cool.... Mark all the eggs as ~todays date in pencil. 2) there are also threads on impromptu incubator OR setup a dog crate as a temporary nursery so the hen can do her job -after all she "seems to want to do this."
3) get ready your food and water dispensers for babies......
4) prep a more stout dog crate for hen and chicks to be staged near/next to the flock so they are used to one-another as the hatching and rasing continues...... See threads on this as well....
(The treasure trove in here is phenominal)