Ellen O'Malley was a pre-War American citizen who was accepted into Vault 114.
Living before the Great War, Ellen, her father Michael, her mother Jennifer and her brother Ellen were all designated to live in Vault 114. Their family, the O'Malleys, were assigned to the Residency A2 section of the vault. However with Vault 114's unending construction they may not have been there when the bombs hit Boston.
Ellen O'Malley is mentioned only in Fallout 4.