Awww that's normal for kids that age. She'll get the hang of studying and school proper when she goes to primary school.
You can make studying fun and less of a chore for her by using other materials instead of just books -- for example, when you want her to learn math, you can help her gain an interest through baking; she can learn how to count and measure by making cup cakes. For spelling, make songs up as you spell. That's how I learnt how to spell. Make learning practical through daily chores, you'd have an easier time and she'll have lots of fun :)
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