I have a 26 week old that hasn't laid yet. She is taking her time.
I had one soft shell egg and I've been feeding oyster shell on the side, but my SS who laid the softie, won't eat the oyster shell on her own. I mix the powdery part of the oyster shell and put it into wet mash.
You'll get a steady egg production soon. It takes a couple-few weeks before their bodies are use to laying. My RIR just laid 11 eggs in a row and I'm worried about her laying too often.