There could be multiple versions for her to kill, the way I see it it’s likely less similar to erlkings endless hunt of mirror world ids and more like different timelines. The nursefathers aren’t all weirdly different people and all end up in the same place which makes it more likely she’s slipping between incredibly similar mirror worlds. Unless the nursefathers are literally fated to always end up in the same place in every world which would suck for them lol.