Thanks for the info. I'm also curious how to handle this specific type of undead since it's not really Dresden canon (at least at the time the RPG was printed). Bringing someone who was actually, honestly dead back to true and honest Life doesn't happen in the books. But like I said earlier, I'm the only one familiar with the source material at our table and I'm totally in favor of cutting some corners on setting in order to bring a more fulfilling game to players that are complete Dresden virgins.
Right now I'm inclined to treat her as a construct made of flesh, give her Human Guise, perhaps some Incite Emotion so that she gives people the creeps (she IS soulless), and maybe give her a lessened version of a ghoul's need to feed on meat (just for fun).
As far as it resolving his Trouble, if he actually brings her back to life (and it sounds like he thinks the motivation to bring her back should be more important than whether or not it's possible) it's going to be that character's endgame. We're talking campaign climax plot resolution stuff.