Spells would be out of the question yes, as that would really hurt her. Though wrestling her to the ground is a viable option. I decided for her to not be completely overpowered, so she only has the silent casting and quick casting feats, not the still casting one.
I might as well explain a little more about what she can do. Her spells involve ice magic like ice bolt, ice storm (as a very high level spell) and freeze, and necromantic magic. Like different levels of undead summoning, inflict wounds and whither, etc. And for debuff/buff spells she has such things as ice shield, chill (slow effect), cause fear, poison, regenerate and energy drain. (basically a mana drain) Though she took a few minor spells for roleplay. Like telekinesis, spectral wings, teleport and comprehend languages.
As for vampire abilities. Summon familiars, which summons a group of ghostly bats and/or wolves to fight for her. Very weak, but useful in this new world as a distraction. Hypnotic gaze, which works as a temporary mind control. It only worked on npc's in the game. And of course the usual faster regeneration, a natural small damage reduction except against holy/silver and a small stat boost to all her stats. (more of a boost in strength, charisma and constitution) Contrary to that, she has a weakness to sunlight, can't be healed by normal cure spells, and her effective level as a caster is a bit lower. She basically casts spells like she was level 90~95 instead of level 100.
I can understand the wanting sexy times part though. xD