Sorry about the outcome. There are too many unknown variables to be able to answer constructively. It appears, from your post, that she incubated and hatched in the main coop, with the rest of the flock.
What is her rank within the flock?
Did other flock members lay eggs in her nest, whilst she was sitting?
Has she hatched successfully before?
Have you hatched before? If so, and assuming it went well, how does this time differ?
I'm sure others will add to those questions.
It can be quite difficult to give advice as we all have different set-ups, husbandry practices, flock dynamics etc etc.