Legal Question in Family Law in Maryland

It depends on the terms of the custody order or agreement, specifically whether it has any "relocation" language in it. MD law forbids a parent from taking a child under 16 out of state so as to deprive a lawful custodian of access to the child or from exercising custodial rights. You should immediately consult an experienced family attorney about filing a petition for a show cause order against your ex. Unfortunately if she's already settled in the new state, you may have to chase her there in order to enforce a MD court order.