She is 100% Not Buying It, but Issy doesn't press. From definite experience, she knows pressing for information can sometimes backfire, so she let's it go.

"It's pretty warm in there. I'd suggest getting a Well Mixed Mocktail from the Bartender." She replies, trying to lighten the mood with a joke and a laugh.

"Except not when it's me, I over-mixed all the drinks."