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Hard to know if it's breed specific or just hen specific. I have some birds that have tougher membranes than others. Come to think of it, they are Olive Eggers with a BCM daddy.

It's not effective, look again then get some permethrin.

@Wyorp Rock has posted some very good questions and suggestions. Another thought is that she may be ramping down production prior to molting, you can get some funky eggs around molting time.