Try to fight her near the throne, when she starts to use her aoe ability, run to the healing thing, lure her into it (she would get some damage) or heal yourself ( you still need to lure her in those things at least twice, though, it would really speed up the whole process), get back to the throne. Repeat till she's dead. I used this tactic on my smuggler and managed to kill in 6-7 min but i can heal myself so it was easier. Hope it helps!