These are kid's books but well and humorously written: The quartet of fantasy novels that begins with "Dealing with Dragons" by Patricia C. Wrede.
The protagonist is a smart, strong-willed princess living in a very traditional magic kingdom, who comes to the conclusion that the only way to avoid having her parents, sister & fairy godmother marry her off to a dimwit knight from the next kingdom over is to escape and become a dragon's princess. Whereupon she finds herself in a world of magic, new friendships, political intrigue and housecleaning.
The first book is a kid's fantasy classic, the last book was actually written first and has a different tone and protagonist than the other 3 and the middle 2 feel a little interstitial ... but it's all a fun read for a couple of afternoons, if you can find them stocked at your local library.
EDIT: First chapter of "Dealing with Dragons" is previewable on amazon. Includes a great proto-rational conversation between the princess and a talking frog.