Hanna's Christmas, by Melissa Peterson

Hanna wishes her family hadn't moved to America. She misses Sweden, she misses the farm, and, most of all, she misses her grandmother. When her mother tells her that she won't have time to prepare a proper Swedish Christmas, Hanna is even more disappointed. Luckily, her grandmother sends her a magical creature—a tomten—tucked away in the packing straw of a crate filled with presents. Hanna's mischievous new friend gets her into all sorts of trouble, but will he find a way to help her celebrate a proper Christmas after all?