Play a game first. I believe you do need to win as well, so you should probably save before trying.
I did play the fairy queen's game, and won, she still wont talk about the plant
She asks for a Gift, you might have pressed the Dialogue in accident already.
Try giving her Cheese after playing with her.
she only asks for things right after when i summon her. not at any other time.
Is there a Fairy outside near the Gaping Plant yet?
No, there no Fairy near the plant
Did you talk to her after the game?
