...was a princess for NINE years, and became a princess in 1987."
Naomi Rivka has a new book about princesses (bought for her in the airport) and it has two pages near the end, one for real life princesses and one for fairy-tale princesses. The real-life one includes a few key facts about Diana, Grace of Monaco, and someone else. The fairy-tale one has Cinderella, Sleeping Beauty and one other.
Guess she's gotten them mixed up - just a bit.