You know she's a cleric of Shar pretty much from the get-go. Look at her gear, her make-up, the onyx jewelry nearby. Heck, her alias 'Shadowheart' is dead give-away.
Every cleric has a deity, when a cleric _doesn't_ display it, that's telling too. There's only so many deities she can be a cleric of.
I suppose if you dump on Int, you can roleplay not knowing. But it's still there in your face.
