Request #517 From Heidi

I’m hoping someone can help with the name of a book I read in the late 80s or early 90s. I think it was pretty contemporary. It was about a young American girl (teen or preteen?) who found out she was the descendent of royalty and went to a small European country to claim her title/live as royalty. The only other thing I remember about it is she had a spunky best friend, and I think at one point one of them said that they didn’t know anything about history except what they learned from “Gone With the Wind”(!) (this was in the context of being told she would have to learn the history of the country where she was a princess. This was NOT The Princess Diaries as it was published at least 10-15 years before that book.