[Yeah, this much was expected. However, she's guessing Sophie's directing her frowning towards disliking the lie rather than disbelieving the lie, so that's fine. She takes a deep breath (though she tries to be quiet about doing so) before starting into the lie she'd prepared.]

They found some messages that some bad guys were sending each other, but they can't understand what they say. So they need someone as clever and good with new languages as Norma to figure them out. She wanted to come right back, but no one else could do it. She told them she wouldn't go for longer than a week and a half [to build in a little failsafe in case something goes wrong] though, because she wanted to come back to see you again.