You need to apply fear to her before she begins dodging, which can happen starting from turn 2. If you fail that, just restart (f12 is quick reset for rpgmaker vx ace). Fear will always land if the attack hits if your luck stat isn't too low. In phase 2, it's the same except you need to guess which one is the real one. Killing a clone heals it. You can tell which one is the real one because the clones do not have evasion and do not counter. Scalpels can be used without spending an action and can be dodged so if you have a bunch you can throw them to test.
As for gear, the ring of fear is good. I also recommend ice warrior armor and helmet as it will nullify her crit chance and provide some resistance against ice. Sniper ring is useless (I am pretty sure Toro did not overwrite the default double roll system) unless you are using something like warhammer, you could replace it with another black rabbit ring, dodge ring, crit ring, or black knight ring. Also bring a club you can swap to for breaking when she charges.
	
		
			
		
		
	
								As for gear, the ring of fear is good. I also recommend ice warrior armor and helmet as it will nullify her crit chance and provide some resistance against ice. Sniper ring is useless (I am pretty sure Toro did not overwrite the default double roll system) unless you are using something like warhammer, you could replace it with another black rabbit ring, dodge ring, crit ring, or black knight ring. Also bring a club you can swap to for breaking when she charges.