I have an 8 year old hen, She has been alone for 2 years. I purchased 4 chicks mid may. I have kept them separate in the same coop with fencing and would like to release together in the same coop. The old hen chases them at large and attacks them when they try to get food. Any suggestions? Do I let them work it out when it gets cooler? (in the 90's +) TIA