I don't think anyone disputes the fact that Shadowheart is dressed in a very Sharran way. For a "secret mission" she's very poor at secrecy.
The point and where the focus should be: How do we get the PLAYER up to date on who Shar is (the big bad evil goddess of the night) as well as Selune. The average Joe-player with no knowledge about the Forgotten Realms, D&D gods etc, would be pretty clueless as to why being a Sharran is a bad thing.
