Catherine, Called Birdy by Karen Cushman

Catherine feels trapped. Her father is determined to marry her off to a rich man–any rich man, no matter how awful. But by wit, trickery, and luck, Catherine manages to send several would-be husbands packing. Then a shaggy-bearded suitor from the north comes to call–by far the oldest, ugliest, most revolting suitor of them all. Unfortunately, he is also the richest. Can a sharp-tongued, clever young maiden with a mind of her own actually lose the battle against an ill-mannered, piglike lord and a greedy toad of a father? Not if Catherine has anything to say about it!