Liselle is a merchant originally from Orlais, specifically Val Royeaux, who sells oils and flowers to the denizens of Denerim. She is new to Ferelden and especially Denerim and although she knows the Denerim Market District like the back of her hand, spending most of her time there, she is still unfamiliar with the rest of the city. Just like Ahren outside of Orzammar, this merchant will not trade with the Warden.