My follower has two restoration spells in her spell list (Fast Healing left hand version, Close Wounds left hand version)

getav restoration -> returns 68 (more than enough)
getav magicka -> returns 330 (more than enough)

Combat style -> set to "Human Magic"
Class -> set to "CombatMageElemental"

Still when the follower is hurt in combat she never casts the spells (whereas enemy casters do). What else do I need to check to make her use healing spells on herself when hurt?

I haven't been able to get my follower to cast healing spells either. One thing i thought of, but haven't tested, is to copy the combat style 'CombatMageElemental' and name it like 'MyCombatMageElemental' and then increase the 'Defensive Mult', this should make the character more defensive, which *might* make them more likely to cast healing spells.

I was able to use a script to force the follower to cast restoration spells

Event OnHit(ObjectReference akAggressor, Form akSource, Projectile akProjectile, bool abPowerAttack, bool abSneakAttack, \  bool abBashAttack, bool abHitBlocked)  int thisFollowersHealth = self.GetAV("Health") as int  if (health < 100)    EquipSpell(HealingSpell,0)    DoCombatSpellApply(HealingSpell,self)  endIfEndEvent

That way, if your follower get's hit and their health is below 100 they will automatically cast the healing spell. You can tweak the numbers to change when they decide to cast healing spells. And of course use a property to specify what healing spell they should cast

You may also be able to accomplish this through Combat Override AI packages.