She is black Ajah. She was left behind to give Egwene the ring so The black ajah could be waiting in T A R, and they where, if you remember TDR. And in Moraine's death letter to Rand she warned him of Verin. As to if she channeled in a steading, it may of been the True power, yet I don't think so. I don't remember the incident that they speak of, yet they connect it to the Ways. Now if you remember, the ways where formed by the one Power as a gift from the dudes going in sane, they where formed by saidin, and as such they where formed OUTSIDE of the steddings, so if Verin was by a waygate, she was not inside the stedding, I dont know if she was, 'cause I dont remember what passage you are talking about.