"Cassandra founded the Inquisition with the left hand of the Divine- she holds some measure of authority over it and is primarily focused on the safety of those in Skyhold." Which begged the question- what set her off so viciously that she would demand an oath of Galadriel?

"There is something more to this- there must be. If I know her grievance, I might speak on your behalf." What worth that might have she could not say- but better that Galadriel have an advocate than none. "What led her to demanding the oath? Such a thing should not be done lightly- it should not be don at all."