Any ideas as to the cause - she is eating the same diet as the others, who are producing normal shaped eggs, she usually only lays every other day sometimes every three days.
We wondered if she was wriggling about on the nesting box which is full of straw and causing the pattern while the shell was still soft.
She is happy and well otherwise.
??????

My other option of course is to attempt to sell it on ebay.
- and yes to whoever answers any chicken query with 'wring its neck and stick it in the pot' - I know that this is a cure-all for all sorts of maladies but this is the daughters chicken - so I can't pop it in the oven (not yet anyway).