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I thought Lorelei might be from Ferelden from the way she called her assistant "pup," and how she seems to be just a little bit more interested in news about the South than most people live met up here.
During the Fifth Blight, Teyrn Loghain sold people from the Denerim alienage to Tevinter slavers to fund his war. Lorelei was one of those people. She doesn't want to talk about what happened, but it sounds like she joined the Shadows after they helped free her—in a rebellion they supported.
Lorelei wears a little wood carving of Denerim's vhenadahl (Tree of the People). It's the one thing she kept from there. The slavers took everything else.
—From Harding's notes on the Shadow Dragons