She did gang some times- she also ran solo quite a bit that I saw. T then again, not many people against her tried to fight here solo either. Even 2 on 1 I rarely saw going for her.
They just ran like hell.
Lich + army + insane phylactery set made her tough for pretty much anyone to handle unless you had the right combo of people, and they were skilled enough to know how to fight her.
I fought Satebos and I fought Ahtiehli solo a few times each with my paladin.
Satebos I actually managed to run off (damn you cloak of displacement!) one time, he PWK'd through massive saves once and killed me the other in a decent fight.
Ahtiehli I didn't even have a chance against.