The title
The Ordinary Princess rings a bell. The queen had six or seven daughters, all very beautiful, tall, and blonde. Then she has her last child,
Amethyst, who is short(er), plain, and brown-haired iircc.
It was a
long time ago when I read the book, and I found it while rummaging through the hospital's school library. Unfortunately it disappeared (along with my other favourite,
The Princess and the Unicorn) the next time I was admitted to the hospital. The teacher had no idea where either book went. :-(
Miranda