Reddit reviews Vampires: A Collection of Original Stories

There's a short story about a Jewish vampire! I'm sure I read it in an edition much older than this one, but I think it's called "Blood Libel," and I think it was pretty good. They do get into the halachah a little bit.

You might be looking for Vampires: A Collection of Original Stories, by Jane Yolen.

It contains a story called Blood Libel by Leigh Ann Hussey, which is about a Jewish vampire who protects a synagogue from Nazis. You can find the full story here.

maybe this one? "no such thing" sounds like the story about the sisters

https://www.amazon.com/Vampires-Collection-Original-Jane-Yolen/dp/0060502223