Nellie O'Malley, Samantha's best friend, is an Irish immigrant who works for Samantha's neighbors and is befriended by Samantha. She personifies the working-class immigrant experience of the time and teaches Samantha about the conditions faced by children who are part of the work force. Nellie and her sisters, Bridget and Jenny, are orphaned and later adopted by Samantha's relatives, Gardner and Cornelia Edwards. In 2004, American Girl introduced a new line of Best Friend dolls; Nellie O'Malley debuted as Samantha's Best Friend in conjunction with the Samantha DVD release. Nellie was marketed with a small collection of clothing and a book written by Valerie Tripp, Nellie's Promise, which chronicles the character's growth and adjustment to her recent adoption.