She isn't "bad" as much as people expect alot from a black unit
+ she is supposed to be a free black (suddenly a premium on nutaku, but still unadjusted stat wise hence high cost)
+ she is outclassed by the other black healer b.iris which boosts defence and attk after SAW. (b.iris is OP)
Her niche is removing abnormal statuses along with her larger healing radius and SAW AOE heals