That's greatthanks for that advice
we gave her a few treats, corn and a bit of tomato but we'll stop for now
she has oyster shell, we have left a small pile in her coop

I also see all of my girls at some point going for the grit. I don't buy their grit, I am lucky as I have stones in my soil so I just go collect lots of that in varying sizes and provide that for their crops. So I will always have a bowl of oyster shell/eggshell and a separate bowl of grit available to them. I find it really helps. Best wishes
