Betsy laid another egg today, her third so far. We noticed her go upstairs this morning and once she had come down there was an egg in the nest box.
The other two also went upstairs for quite a while and Amber was definitely in the nest box, but not surprisingly there were no more eggs, although Amber's comb is beginning to grow, but only one tuft or notch or whatever it's called, so far. We did start to wonder if they were unwell, but they were fine after lunch. Perhaps it's all part of getting ready for egg laying. When you haven't kept chickens before it's hard to know what is normal behaviour and what isn't.