by Susan Fletcher
I read this at least a dozen years ago. What I remember: there is a young girl (possibly adopted, but definitely less parentally favored) who tries to save her sick younger sister with doses of dragon's milk. To get the milk, she makes a bargain with a dragon. But after the mother dragon is kille...
i remember liking this book, but i read it like four years ago ... i remember that i hated the ending, but i won't give it away.