She was a full Diet member too, all the important people around her are her peers. She's the voice of the opposition to the invasion.
She's doing exactly what we'd expect her to be doing, stirring up shit to try to make a bigger name for herself and increase her chances of being re-elected or even gaining higher office.
It just backfired on her horribly, because fire dragons are incomprehensible to someone who hasn't seen one or believed the reports were lies (like she obviously did).
Can you honestly expect her not to be rude to Rory? Tuka is dressed up in a suit to match the proceedings she's at, Lelei's got some rustic but formal enough traditional clothing on, and Rory is dressed like a Goth Loli from Harajuku, 10 minutes down the street from the building they're in.
Her reactions were all quite normal and even expected.
Sir, do you even politics? This is how it is supposed to work.