Serana Can't Be Healed with Necromantic Healing (She's a Vampire)

GameInquirer

Honorable
Jul 25, 2013
2
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10,510
I try to heal Serana with healing hands early in the game and it says resists healing hands, I understand and go back into the crypt to get the necromantic healing spell.
After I do, I try it on Serana in numerous locations and it does not work.

Important: I try to damage her and heal her in an attempt for the spell to work, the crossbow bolt goes right through her and into the door behind her.

Anything I can do so Serana can become a normal, hittable, and healable follower?
It's really getting annoying :L

I don't want to hurt her, I want to heal her in combat. :p
I want to heal her when she is limping so she can get back in the battle, but this is not working :p
EDIT: I hit her with a firebolt spell and it hit her, but no damage, no expressions, no nothing from her. It didn't affect her.