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.
And to this day I am very sad that we can not be sarcastic when she finally "reveals" her poorly hidden deity.
I mean, for a deity of secrets, she is impressively bad at keeping them.
So, you can *also* roleplay someone who thinks there is something off with it. Basically, finding out why someone who prefers nice actions is plastered with the symbols of the goddess of darkness, secrets and entropy - because that women does not really make much sense.