Really, Nina would have been willing to let the tragically rough dig go past uncommented upon had it not been said in conjunction with the rest of his words.

Sure, she wasn't supposed to know he was leaving in the first place, but Nina had no shame.

"Oh, good!!!!!!!!!!!!!!!!" She beamed at him. "They contacted you, then?????????????? That's great!!!!!!!!!!!"

No shame whatsoever.

Besides, obviously if he wasn't going to tell her when he was going to be on the island and not it meant she had carte blanche to go looking for that information, right?