Lol fuck me,
source.
Citing (all major points):
How if she touches a wall she should start summoning and chain CH'ing.... not turning into an exploitable gimp!
Level 53+ behavior outlined.
Range being the only safe way to avoid breath/fear, not LoS.
Healing through walls not being viable (maybe should go under more research but I feel like this is conclusive to me, wouldn't it be obvious to just position her near the rock and heal through the wall? Goes under things that weren't broken at any point in live, won't find patch notes or outlines of people even trying to do it)
More research required:
4 slot dispel breath (I can't quite back this but what a find)