Completed it after like 15 tries on my 920 rogue. This was literally the first time I touched this spec. Killed myself on purpose a few times because I didn't like the positioning of some puddles that the fuming imps dropped.
What I suggest is to not use Roll the Bones, but use the talent which replaces in the bottom talent row. Got her on the second attempt after taking it as it helps melt the adds down.