You didn't know what? That she went to a party? One of the most beautiful women of her generation got in invited to the party of an enormously wealthy man? Shocker.
She's not glaring at anyone, look at the set of her mouth and the point - she's clearly mid-conversation.
I'm not defending NC as a person - she's behaved terribly on so many occasions and is completely blinded by the hubris that being rich, famous and gorgeous affords people like her, but this is ridiculous. There are far bigger villains in this story.