Draw a line from Tear to Arafel and it carries straight on to Shayol Ghul. She could make a handy proximity alarm for the Dark One to warn of Rand's approach (though I doubt this is the case).

Given that no weaves for creating a gateway were detected, that could suggest she's been fetched by a man who can channel (perhaps for turning) or even a Myrrdraal. It may not be coincidence that we hear about Naeff's madness and Myrrdraal lurking in shadows at around the same time and place.