[Zateel]

If you speak with her, and choose to "change tactics", one of the options will be how much damage you should take before she tries to heal you. Also, if she is using ranged weapons and you are melee it might take some time to get to you (healing spells are touch spells). I haven't played her much yet, so I'm not sure if she has a healing spell right away or if she has to reach a certain level before she tries to take one. I hope this might help...