Yeah, that's how it feels to me. If you have a committed group to help you get the debuffs to actually land, she'll burn. But when it's just me hosting, and I need to get the bar down a little before anybody else will join, seeing the debuff resistance down fail means I'll be lucky to get 10% def down out of the ~60% I drop on her, which means I'll not be taking 10% of her health, which means I'll be lucky to find anybody else to join.

But, when that debuff resistance down does hit, she snowballs out pretty quickly.