Mirta hails from the Dominican Republic and has been involved with the Paso Fino breed since she started competing in Paso Equitation at age 4. She is a certified judge and member of the Paso Fino Horse Association and USEF, and holds the title of International Paso Judge, issued by the Confepaso International Foundation. During her career, she has judged in the U.S., Puerto Rico, Curazao, Aruba, Colombia, and the Dominican Republic, with shows including the 2021 Mundial Confepaso, 2022 Ocala Cup, 2022 Nacional de Chalaneria, 2022 Mundial de Jinetes y Amazonas, 2022 Feria Himno y Bandera, 2023 Miami Summer, 2023, Mundial Confepaso, 2023 Nacional Adopaso, 2023 Gran Nacional Curazao, 2024, Grand Nationals Championship PFHA, and 2024 Gran Nacional Los Abiertos. 

Mirta was also a member of the National Equestrian Paso Team from 1998 to 2006, captain of the Dominican Equestrian Team at the 2006 Youth Mundial, placed first and second in the 2004 and 2006 Youth Mundials, respectively, and was the Dominican Republic National Champion from 2001 to 2011. She is a member of the PFHA Judges and Stewards Committee, secretary of the Confepaso International Judges Committee, and is also a national judge of Paso Higüeyano horses. Mirta breeds and still competes her horses at her co-owned ranch "Hacienda Ramia" in the Dominican Republic, and when she is not with her horses, she works professionally as an attorney and runs her goat cheese production company.