My almost 1 yr old golden comet just laid a egg with no shell just yolk fell out. Shes been laying fine for about 4 months. A few days earlier a got a really oval egg but i didnt know which chicken laid it. Its been cold for 2 weeks ranging from 0-15 degrees, i been keeping the coop about 20-35 degrees. I dont know if shes sick or what. What should i do?