Why didn't he just spit it out if he was trying to ask her something? She was in no mood for riddles, and riddles weren't usually Jack's modus operandi.
But then she remembered about the bet that Maple had mentioned, and sighed. "You can stop trying," she said. "Maple already knows I forgot. She caught me at my place... saw the calendar and everything." After all, Lacuna had wanted to deny it too. She couldn't, given the amount of evidence. There wasn't any hope left for poor Jack.