Have a tank, haha or a buddy with a taunt
1) Kill first wave of adds.
2) Stop damage when they are down and aoolw the tank to pull her down the hill and far enough away that she resets.
3) When she reappears in the centre, wait for the tank to come back, then….
4) Mow her down!
Thanks to the poor person that has spent the whole morning yelling instructions in the zone XD.