Maryland Code, Family Law § 5-328

(a) If a local department is a child's guardian under this subtitle, a juvenile court:

(b) If a juvenile court designates an individual as a child's guardian, the juvenile court:

(c) An order for adoption of a child terminates the child's guardianship case.

(d) On termination of a guardianship case, a juvenile court shall close the case.

(e) Notwithstanding subsections (a) and (b) of this section, if the court enters an order directing the provision of services to a child under § 5-324(b)(1)(ii)7B of this subtitle, the court retains jurisdiction to rule on any motion related to the enforcement, modification, or termination of the order, for as long as the order is effective.