With Yasa being the only one in the village and her being chief unless you get an event that brings you more villagers when yasa gets to 14 she won't be able to collect the collectables and mushrooms anymore so will have to make magic food once a day just to survive. The worst is that your game will end when she dies. Without other villagers you can't complete the puzzles or tasks. You should have her making magic food now to supplement the mushrooms. This she can do with level 1 leadership if I remember correctly.