I barely poked her and she died...so I unfortunately do not see the difficulty issue? Care to elaborate on it, range and gear?
It's not so much the range, for me. It's more of a "squishy" issue. I'm a wind archer, so I am peek "glass cannon," and I've died like 3 times trying to kill her in story mode. I think you kind of need to be a tank class to put up with her.