I'm so sorry this happened to you.....don't know if it will help but another lady suffered the same loss a day or so ago. Perhaps the two of you can help each other heal...it's going to be a long time until you get over this, I know. But I'm glad that the coop was far away from your home and nobody else was hurt.
https://www.backyardchickens.com/t/1145876/dont-use-heat-bulbs
https://www.backyardchickens.com/t/1145876/dont-use-heat-bulbs