Katherine Applegate

"The true story of Ivan, known as the Shopping Mall Gorilla, who lived alone in a small cage for almost 30 years before being relocated to the gorilla habitat at ZooAtlanta"--

When Hallie and her parents join a wagon train to Oregon and leave her grandmother behind, Hallie must learn to face the storms that frighten her so, as well as other, newer fears, with just her grandmother's quilt to comfort her.