The Board, in assenting thereto, may receive into its charge, custody or guardianship, any girl not over 18 nor under 11 years of age when committed thereto in any 1 of the following modes:
(1) The Family Court and the Superior Court may each commit to the custody of the Board any girl who is subject to the jurisdiction of such court and who is a delinquent child, as that term is defined in § 901 of Title 10.
(2) Whenever it appears to the Family Court that the best interests of a girl who is living in circumstances of manifest danger of falling into habits of vice or immorality will be served by temporary care and further study of her case, pending a final disposition thereof, the court may commit such girl to the custody of the Board for a temporary period not exceeding 3 months. At the end of the temporary period of commitment, the Court shall make final disposition of such case.