She seems to understand less about her abilities than... well, anyone else. Which is odd, considering Orochimaru called her one his favourite experiments, surely she'd have the wits to pick up what information she could from his research.
She possesses a useful ability - well, two if you include her sensor skill. But when it comes to the Heal Bite, as far as I'm aware she can't use it often due to the fact it will kill her.
So she's not a 'healer' in the same sense as Tsunade, Sakura and Kabuto. She knows little about actual medical ninjutsu which was proven when she attempted to use (in the anime) the Mystical Palm Technique with lesser skill than a med-nin.