You've got to get obsessed and stay obsessed

I like the idea of her living through the attack but suffering from permanent aftereffects, be it scarring, other injury, and/or becoming a werewolf herself. I'm always interested in the exploration of post-war damage, both mental and physical, and a few post-war stories I've read have had really interesting takes on Lavender adjusting to severe facial scarring or wolf-like tendencies. I really don't consider any movie-only things to be canon, and from what it says in the book there's no reason to believe she's dead.