Generally speaking, you don't have to, barring her Shriek 1HKO.
That said, it sure helps.
Either way, yes; duty finder generally isn't bad at all. I've had maybe one bad DF experience (which was kind of a riot; long story short tank kept insisting we kill bees on Demon Wall, ragequits when we keep wiping even after I suggest ignoring bees, first tank to rejoin we just ignore bees with and literally no problems whatsoever), but otherwise it's been fine.
