Thats good. let her eat as much as she needs. If you run low on food, pause the game and wait to find more mushrooms. When she hits 14 she will be able to gather food for herself.
Remember that keeping the game on 1/2 speed will make her age slower, but it will give you more time to gather mushrooms. If you are going to run the game on 2x speed to get her to age faster, watch the game closely. It would be a shame for her to die now.
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Why is it that if someone tells you that there are 1 billion stars in the universe you will believe them,
but if they tell you a wall has wet paint you will have to touch it to be sure?