This is a book I read as a child and borrowed from the school library in the early 1990s. I’m fairly certain it was a fictional book, not an autobiography. I think it was called ‘Under the Mulberry Bush’ but could be wrong, as I can’t seem to find any book that matches that. It was about a girl (possibly with a French grandmother?) who goes to live with another family that’s experiencing some financial troubles, and they have a lot of mulberry bushes, which means that they have a lot of silkworms, which eat mulberry leaves. She comes up with the idea of using the silkworms to make money by harvesting the silk they produce and selling it. It’s a very risky proposition, and it takes a lot of exhausting work because she doesn’t know anything about silkworms and harvesting their silk, but she manages to learn all she needs to and get it to work. In the end, she saves the family and falls in love with one of the family’s sons, even though they didn’t get along at first. (and I want to say they have some sort of private joke about crab apples, and in one of the ending scenes, he throws a crab apple at her and she catches it)
Sorry, I don’t have much more than that! As a child I remember it being a sweetly romantic tale that I would love to buy and reread.