As 32 dps Operative, it took me at least a dozen tries with different strategies, but only 1 death. If things are not going well, just run out the green shield to reset and try again. Some of my tries bungled within 10 seconds, so I'd just run out. No need to fight to the death, lol. Anyway, what finally worked for me was to concentrate primarily on interrupting the AOE. I got within melee range of Zhorrid with Kaliyo on attack. Zhorrid's AOE takes 5 or 6 seconds to cast and I'd let her get within a second of completing before interrupting. Meanwhile Kaliyo would be kicking the snot out of her, basically for free and unanswered for that 5 seconds. I would not interrupt the force lightening, only the AOE, the 3 interrupts available aren't enough for Force Lightening, too. The AOE is absolutely a butt kicker, the force lightening, not so bad. I would occasionally throw in the knife attack or corrosive dart, when I thought I could spare the time and the global cooldown. If she got off an AOE, I'd just run out and reset. On the final round I did no healing at all, it was too hard to monitor for a cast of AOE with Kaliyo targeted. Kaliyo died with Zhorrid having only 1-2 thousand HP's left and I was at full health. So I went into full dps mode and Zhorrid didn't last long after that.