I'm trying to finish the rescue mission in Gandara, the one where you have to dress up like Kournan soldiers and infiltrate the place. The mission is really quite easy, until you get the annoying lvl 16 NPC that you have to protect.

How do I keep her from dying? I've even tried bringing 4 healers with me, but she still dies at the last group of enemies before the boats, sometimes even earlier.
I'd really appreciate some pointers, this is definately the most frustrating mission I've come across so far...