I'm not sure exactly what this 'forced my little sister story' is about without more context. It could be something where she was forced to do her homework, or forced to go to a place she didn't like at first. There are many possibilities.
Perhaps in the story, she was forced to take part in a school play. She might be very shy and didn't want to be on stage, but the teacher or her parents thought it would be good for her and made her do it. And during the process, she overcame her shyness a bit.
One way could be to take away her privileges like not allowing her to play with her favorite toys for a while. For example, if she misbehaves during playtime with friends, this can teach her that bad behavior has consequences.
One way could be to make her do extra chores. For example, if she's been mean to you, ask her to clean the dishes for a week. It teaches her responsibility.
First, think about her interests. If she likes princesses, start with a princess as the main character. Then, create a simple plot, like the princess trying to save her kingdom. Keep the language easy to understand.
I babysat my little sister last weekend. We baked cookies together. She was so eager to help, but ended up making a bit of a mess with the flour. However, the cookies tasted great in the end.
Some popular story books for little girls could be 'Alice in Wonderland'. It's full of wonderful adventures and strange characters that can easily capture a child's imagination. Another great one might be 'The Little Princess', which teaches about kindness and perseverance in difficult situations.
Once, my little sister broke my favorite pen on purpose. So I punished her by making her clean my room. She was not happy at first but she learned that she should respect others' things.
Some popular story books for kids that might be her favorite could be 'The Little Prince'. It's a classic with beautiful illustrations and deep meanings about friendship and humanity. Another one could be 'Charlotte's Web', which tells a heartwarming story of friendship between a pig and a spider.