Haha. To split a hair, I think Marion was being insincere - she thinks it's ridiculous that an ogre won a beauty contest - but she's not being sarcastic. That is to say, she's feigning sincerity for Mor'Lag's benefit, not parodying it to mock her. That said, given Mor'Lag's melancholy, I think it's easy to imagine that she took Marion's words to be mockery. We have a tendency to hear validations of our own self-image, after all.