There are 2 books in the East series. The newest book is West which came out in 2018.

1
East

Book cover of East
Full of fear and excitement, Rose, a young woman, journeys to a distant castle on the back of a great white bear, only to find that her journey has just begun, in a retelling of the classic tale, "East of the Sun and West of the Moon." Jr. Lib Guild.…
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2
West

Book cover of West
When Rose first met Charles, he was trapped in the form of a white bear. To rescue him, Rose traveled to the land that lay east of the sun and west of the moon to defeat the evil Troll Queen. Now Rose has found her happily-ever-after with Charles - until…