Getting her along was tricky but not impossible. Just have to keep killing the roamers before you pull and find a good opportunity. She dropped the secretions the first time. His for up to 800's but pretty much casted the whole time. Kept casting Shock of Steel on me for about 190 damage. I was able to partially slow her with Myrmidon's Sloth X. My Bite of the Shissar XIII was landing half damage. I took her pet out first, which was hitting in the 100's.
By the way, I am a 76 ROG with T2 healer merc.