I think she will spare anyone who fully transforms and has yet to cause damage. From her perspective, once the human element is gone, its freeing a trapped animal.I don't expect that Wife is spared instead of her daughter.
If it isn't an axe then it's honestly a pretty bold storytelling move and I kinda respect it.I honestly I don't know if these are signs of an axe or just intentional story decisions. Cause from the start it was obvious cattelya would be some kind of end game villain, not this group.