Interesting, but I don’t think she is. She laid her eggs in the nest from the start, and she doesn’t go off on her own or like to be away from the flock for any length of time, but anything is possible. Now that there is a massive snow storm spinning overhead no chicken wants to venture out, so any rouge egg layers will be easily identifiable.But in your case there is another possibility. Is she hiding a nest? Just one of the possibilities.