Lulz, she never said you have power over her.
And it seems Cassandra falls in love with the Inquisitor in spite of those things, not because of it. That was kind of the point of the the scene when she acknowledges the flirting.
She does say something like that or at the very least, words I interpreted to that effect-don't have the exact words in front of me though, and a quick google search produces nothing. Have to research later.
And to me, some of the courting scene is about her disbelief that this religious figure, who has so many important things he should be doing, is interested in her.
I'm sorry you don't interpret the character that way, but isn't it a bit fun that Gaider wrote a character that could be interpreted differently and has some nuance?