Why are you playing along with the little slut? Just have her executed then and there, along with his family for "disrespecting the emperor" by implying that "the emperor's sister is equivalent to her maids" and thus "the emperor is equivalent to a butler of her family". It's utterly idiotic to play along with these charades when you have more than enough ammunition to have them executed and cut all of your troubles away in an instant. But then again, gotta have that stupid drama so the sad excuse of a plot works.
After all, she's the one who started this debate, so she needs to provide proof of not having any ill intentions. Only an utter moron would not demand that. But then again, as I earlier did say, gotta have that stupid drama so the sad excuse of a plot works.