Is it possible for you to pay for a cousin or close family friend to come expressly so that they can take your daughter back to Maryland.
My FI has a disabled daughter, and when we were considering bringing her, we decided that if she went, we would pay for her babysitter to come to the wedding to be with her, and be responsible for getting her back to the states. It had to be someone familiar with her and who she felt comfortable with. (In the end, we decided to leave her in Maryland and celebrate with her later.) It's an idea though!