Black Lily is Baldur's Gate thieves guild merchant. Despite her membership in criminal organization based on thievery in the original BG1 she won't buy stolen items in her shop. In BGEE however she will buy stolen goods. If you use charm magic on her, succeed, speak to her and she will say magic use isn't appreciated in the guild and threatens to kill you after the charm magic wears off.
The mod Expanded Thief Stronghold adds a quest to the Shadows of Amn Thieves' Guild Stronghold in which Black Lily and Narlen Darkwalk appear in Athkatla. After the quest is solved, Black Lily provides her services at the thieves guild.
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