This character concept is interesting but I do have a few questions and concerns. First, how is this character going to fit in your gaming group? This character would be viewed by most groups in the Dresdenverse as being on the Sith end of the scale. This would make it impossible to work with most of the major supernatural powers and their members and allies. If anyone in your group is a Wizard, a member of the Venatori Umbrorum, a Champion of God, a True Believer, or a Sidhe Knight, there is no way they will be able to work with this character because they will have extreme animosity towards her behavior (not to mention the fact that the Council would view her as kill on sight).
I am also curious, why does she not have Thaumaturgy or the Sight? It would seem to me that broadening Elena's abilities would make her better able to function in what is not going to be a hostile world for her. It would also seem to be crucial in order to justify the wizard level evocation specializations that Elena has (my math may be off, but it looks like she has 6 levels of specialization when non-wizards are capped at 3- the base one that comes with evocation and the one level of refinement permitted for non-wizard evocators).
The sight overcomes Illusions. Elena's veil is not an illusion; she literally exits reality so she won't be perceived. (She is using 7th-Law violating magic to do it. Not spirit illusions)
This is not going to work as a veil because the magic that lets her see what is going on in our reality
would be detectable via the sight and thus she could be targetted that way.
Also, if you teleport sb over a volcano, they will die through no action of any other creature. If you teleport someone into a dragon's lair, they willdie through the dragon's actions - or even their own. So the final act that kills them? Not your doing.
There is no way the White Council would ever buy this. Allowing this kind of action would make it possible for a practicioner to kill helpless mortals with magic in such a manner as the mortal authorities could not cope with (teleportation to another realm as murder weapon does not fly in court). The wardens, not to mention the Senior Council, would go berserk and begin a witch-hunt. Considering the ease with which the distortions to reality created by her powers could be tracked (cf the the tracking of necromantic energy in
Dead Beat), this would the survivability of this character problematic.