Hard to say what the status of the queen is. If you had marked the original queen it would be easier to determine if this was her. If you're as curious as I am and you have other hives that are stronger, you could give them a frame or two of emerging brood with some honey, then in a few days you could see if she begins laying. Presently there may not be enough bees to keep any brood warm enough, hence no brood area.