Wildwing by Emily Whitman (2010) - When Addy is swept back in time, she couldn't be happier to leave her miser-able life behind. Now she's mistaken for Lady Matilda, the pampered ward of the king. If Addy can play her part, she'll have glorious gowns, jewels, and something she's always longed for—the respect and admiration of others. But then she meets Will, the falconer's son with sky blue eyes, who unsettles all her plans.
This seems like a really cute romantic historical fiction. I might just have to read it eventually.