Who is Sapphire Ekdahl from Ghost Girl: The True Story of a Child in Peril and the Teacher Who Saved Her and what is their importance?

Sapphire Ekdahl is Jadie's infant sister. Jadie tells Torey that Sapphire was first molested at the age of one year. Jadie reports that the men put their fingers into Sapphire's vagina while Sapphire hung upside down on a stick. Although police find Sapphire's hymen is broken, a discovery that is uncommon for such a young child, the broken hymen alone is not a cause to suspect child abuse.