Welcome, and thank you for sharing your "chickens" story. I would love to see pictures if you have time to upload. It sounds like you have a great variety.
Your hen would look something like this. When getting more hens, I would stick with the barred rocks instead of the RIR's. They lay less eggs so they will not get reproductive disease as quickly.
Welcome. Scottie, I use heat as well as many members here. I always keep my coop above 40 degrees. I use a safe radiant heat, so no fire danger. You don't know how old your flock is, and most definitely, the older chickens and those sick absolutely need to use their energy to get healthy, not...
IF the lash egg came from her, then salpingitis is likely and calcium is warranted, but IF she has EYP, then calcium should not be given. We just don't know. The important thing is antibiotics right now
It is highly likely that she has EYP or salpingitis with a secondary respiratory infection. It is also likely that she is the lash egg layer. Here is what causes it...it will make you sick to your stomach.
Hens, and their bodies - in nature lay 10-12 eggs per year. 100-years ago, they only...