ABANDONED. Collection of short horror stories - one evil twin, another a monster slayer (spoilers)

[Hannah]

Trying to find a book of short horror stories I read a while back.

In one story, the narrator is a monster slayer who hunts shapeshifters who impersonate people, but then it's implied she's actually crazy and has been killing humans.

In another a woman's identical twin steals her life. The evil one cuts off her sister's face so she can't be identified and feeds it to her dog, then ties her up and throws her body in a swamp.

[Hannah]

bump

[Lobstergirl, au gratin]

Hannah, are you still looking for this or did you find it?

[Hannah]

I never found it. Kinda gave up at this point, but thanks for asking!

[Kris]

Hannah, are you still interested in finding this book? We're happy to keep your request active.

[Lobstergirl, au gratin]

No response, moving to Abandoned.