Ah yes, all the people around to hear as she speaks in Japanese lmao
Anyway, as far as it goes, fire barely fazes Velvet. It can burn her to ashes--one of the few things that can really actually discorporate her--but she'll put herself back together in her crypt at the next midnight. She might even thank Miyuki for doing it, it's honestly probably easier than dealing with the pain of injuries, even if they heal quick. Velvet is nothing if not obscenely hard to hurt in any meaningful way and you need to jump through way too many hoops to have a chance at killing her. The only spells that might be dangerous would be spell that conjure sunlight. For, yknow, obvious reasons.
Though, fair point on the curses. She'd probably know, at least to some extent. Which means she might actually be cautious of something for once in her stupid immortal life, it'd suck to deal with a curse of misfortune for the next who knows how many centuries.
Operative word stupid, though. She's definitely an idjit, and humans are her main food source, after all. So really, who knows?