I could see this being harder for the holy trinity group, but with my setup I've had little trouble. I've never wiped to her and don't even use pots or resist gear. Here's what I do. Just spread out my shaman in an arc around her, trying to keep them within 35 yds of each other so she's always in range no matter who she's beating on. The druid will stand in the middle. I drop a pretty standard set of totems, including an FR totem of course, and I drop 2x fire elementals and 2x earth. One of my shaman spams max rank chain heal while the rest of the team nukes away. I usually lose one or two guys, but I've never wiped in 4 or 5 tries.