I have a hen that has always layed imperfect eggs then one day layed a shelless egg and now for over a week has stopped laying completely. She goes and sits with my other hen when she is laying but never lays one herself. Now I am noticing her doing more sitting in the backyard. The two of them usually hunt and peck all day together and then rest or take dirt baths together. Now I see the now layer frequently just sitting by herself. Any ideas on what is happening....do I need to take her to a vet? Thank you!