My thought is that the Hermit took her, so that OP would be forced to play the game. Part of me wonders how he heard about this game, since it's the first I've heard about it. What if it likes targeting specific people or families? OP, if it's not against the rules, I'd try to find a good way to warn Stacy off from playing this game.

Or... what if the reason Stacy disappeared was because she was trying to play the game herself but failed?