yes she is next, no one else show up in between, he don't really kill her, but he torture her for some time, then when you think he is going to forgive her by turning her an ally, he turn her into a conscious monster and send her away to fight remnant of the demon king army, in the after story, she didn't die because never found any, but is forever in that form trying to hunt demons due to the subordinate order mc gave her and running away from whoever that try to hunt her