It’s a children’s book from the 90s about a girl who has to be home from school for an extended period (broken arm or leg or something?). She’s bored. She is given a cardboard box full of art and craft supplies. She starts making all kinds of things – I think maybe a whole little town made of construction paper? With little dogs and everything? If I remember right. Her older siblings are snarky about it but eventually they get jealous and start helping her. I think she had an older brother and sister, but that detail is foggy. The big box of art/craft supplies is what really sticks out to me.