1980s illustrated kids book about a rough-and-tumble girl, possibly even a raven, crow, or black swan turned into a girl, who grows up to be a conventionally-beautiful, but still willful princess. I read this around the same time as “The Balloon Tree”, in the early 80s.
The description made me think of ‘Tatterhood’ by Robin Muller (tomboy girl, striking black hair, eventually becoming a princess). The date (1980) and the publishing location (Canada) match up as well. http://www.goodreads.com/book/show/9526361-tatterhood
Solved! It is ‘Tatterhood’ by Robin Muller. Thanks, Marisa!
Happy to be able to help!