She's clearly stressed out. How small is her enclosure? Are you allowing her to settle in disturbing her a little as possible? How small and snug are her hides? Some are just more fearful than others, and she sounds like she only views you as a huge heat emitting predator. You can try to fill her enclosure with loosely crumpled newspaper to try to settle her, then slowly wean her off the paper, removing a piece or two every few days to once a week if she's in a particularly small enclosure. You can drop a live hopper mouse in with her and the paper on feeding day and just walk away and check back in 1/2 an hour and remove it if she doesn't eat.