Unis nullifies all "sure hit" or "unavoidable" attacks, weapons and abilities, so Miranda's axe isn't helpful, try Gungnir (max upgrade Partisan), also upgrade a couple of the weapons (butcher greataxe becomes useful too). Try substituting one White rabbit ring with a sniper ring. Any abilities with "unavoidable" are useless, your first focus should be putting fear onto her, after that just try dealing damage (poison, bleeding, frostbite and stun work too) and, once she starts the "clones" fase, try using AOE skills. Her charge-up can be broken with hard break, but not with normal break (haven't tried gun break, though).There is a guide a couple of pages back, look up "Unis".