Low egg production

I have a small flock of 15 (8 layers, 7 pullets). We do not free range because of predators. I have had chickens a little over 2 years. Just had a RIR die, she had a pale comb for a few days and was just looking off. She had started her molt so I didn’t think much of it until I found her dead today in the run.

No other chickens are sick. I’ve inspected everyone for mites and lice, everyone’s poop looks normal. Everyone is acting normal except egg production has been SO low for a few weeks - like 1-3 eggs a day. I just assumed it was because of the heat and some of them have started molting.

My question is, should I do anything to treat my birds? Why would egg production be so low? Should I deworm them if there has been no suspicion of worms? Treat for coccidiosis if poops are normal?

Please note I do not have a vet that treats poultry near me.