[ Since it was a party hosted by Elizabeth, that meant Selina had to attend to. Alright, the Queen had told her she didn't have to come, but Selina knew better. She was Elizabeth's lady, as well as something like a personal bodyguard. That meant being a big girl and going despite the complete lack of a drive to actually go.
In a dress that Elizabeth had designed for her, with a matching mask, shoes, and hair style and cat ears that Tony Stark had given to her, Selina tried to stay off her feet as much as possible. Even with resting as much as she had, she didn't want to to take too much of a chance in re-injuring her ankle. She thought it was appropriate to dress as what she really was, as opposed to who she wasn't. A brazen costume for a cat burglar, someone had once told her. Not that she cared.
Selina was either sitting with Elizabeth or moving around the outskirts of the dance floor, investigating anyone that Elizabeth had shown interest in--or had shown interest in the queen. That didn't stop her from stopping and talking with someone she knew, of course. ]