The Doll People, by Ann M. Martin & Laura Godwin, 2000

Annabelle Doll lives with Mama, Papa, Nana, Bobby, Baby Betsy, and Uncle Doll in Kate Palmer's bedroom, but Auntie Sarah Doll has been missing for over 45 years. Her family thinks it's too dangerous to venture out to find Auntie Sarah -- after all, they could end up frozen in Permanent Doll State, and lose their ability to think and move and talk! But Annabelle is determined, and with the help of her new friend Tiffany Funcraft, a plastic doll belonging to Kate's little sister, Annabelle finds a way. An interesting addition to the small (and dying) genre of doll stories, the text will appeal to girl readers in grades 2-4.