I can't get Mona's last heart. i did it before on my previous run, but can't now. i did the quest to gather a red herb in the snow biome. i read that's supposed to give me the 4th heart, but that one gave me the 3th one instead. (by the way, I'm making a guide on steam listing everything from quests to puzzles and treasures, so that's where my progress in her affection hearts is listed.)