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Mahalo!! That makes perfect sense to me. I'll keep my eyes on her.I think you can see a smaller one next to it towards the top of the egg..it looks to be a "patch" of extra calcium and shell which can chip off leaving a "pothole."
This happens from time to time, and is nothing to worry about unless it begins to happen a lot with one bird...that can indicate some defect in the egg tract/shell gland.
LofMc
Here's a good link for egg issues:
http://www.thepoultrysite.com/publications/1/egg-quality-handbook/