How old is she and in what condition (?good weight for her size). Hatching a clutch of eggs takes a lot out of a hen. If you're happy to try you could try putting her with a few eggs in a broody coop and see what she does next. If she settles happily, fluffs up her feathers and tries to peck you if you put your hand near her then it may be worth putting some fertile eggs under her.