Maybe she is broody?
My girls love the nesting box HELP - Page 2
Agreed - anything that simply blocks them off. Even some spare chicken wire is another possibility. Doesn't need to be pretty - it just has to do the job!
My coop (shed) consists of a few bits of wood, some tree branches for roosts and plastic basins for nest boxes - not quite the Ritz but is does the job.
well maybe. she is only in the nest box at night though, in the day she is ranging around with the rest of them. If they are broody don't they just want to stay in there all the time? I haven't had one do that yet, but I've only had chickens since May
Ah, seems like she has just picked up a bad habit since she is out and about during the day. As SusanD and others have said on this thread - block the nesting boxes off after they have laid and all night.
good idea, I think I have a piece of plywood about the right size