I just defeated her five minutes ago as a 32 telekinetic sage, with the help of Tharan.
Its true she is more difficult than a usual elite around this level, but still managable.
Make sure to keep Force Armor up, and interrupt her Force Quake immediately. Dont forget to dot her aswell. The rest is just pewpew, make use of your procs. 2-3 big heal wont hurt through the fight, Tharan handles the rest. He also stuns her with Holiday sometimes, this companion is a win imo.
I would recommend not interrupting force quake but just move out of it before it goes off. that way she wastes all that time casting/channeling it instead of attacking. if she is targeting your companion however then interrupt it since they are too dumb to move.