BINGO! An adult corn snake should be fed about every 10 days (to 14 days). Too much food for a mature corn snake!
How long is she? (approximately) And what size rodents (& what kind) are you feeding her? She'd do fine on average sized adult mice only and only ONE per meal- NOT jumbo mice, ever. OK? (large aka jumbo mice are way too fatty- they're old breeders, not good for most snakes) No wonder she's not eating...