As a general rule, the creator of a tangible medium, e.g., a video, owns the copyright to that video. Therefore, use by another infringes upon the copyright. Assuming you can show the rights in you and show that none were granted to her, you would be entitled to recover damages in the sense of lost profits, i.e., probably money she has made using the video.
You could seek injunctive relief against her from the court, i.e., a court order to cease and desist until the matter is resolved. Copyright litigation is done in federal court in Baltimore or Greenbelt.
If you wish to pursue the matter I am happy to discuss with you.
Cicero, Mehta & Sprang'
1000 Potomac St., 5th Floor
Washington, DC 20007
Admitted in MD, DC
Sounds like the only option is a lawsuit. Speak with a local litigator with copyright experience. Good luck.
This answer is for informational purposes only and is not legal advice regarding your question and does not establish an attorney-client relationship.
This could get expensive. If she will not respond to a lawyer's cease and desist letter, then you will be filing for injunctive relief, plus a complaint for damages if you think she has any assets to go after. Is she in Maryland like you? You should also be contacting the ISP/web hosting service that provides her web page and demand the video be taken down as a violation of your copyright. Be prepared to provide evidence that it is indeed your product and she was just paid talent (did you have her sign legal releases before using her? Please say you did).