I have 3 Barred Rock hens and of them hasn't started laying yet. My other 2 started in November and faithfully give me an egg a day. The one who hasn't started laying, received an injury to her comb/head, a couple months ago. She cut her comb on the fence while trying to reach through for some green grass. I was wondering if something like that would set her back. The area has completely healed, but her comb is not the healthy red, like the combs of the other two.