In the mirror universe, Miral was a Klingon female of some influence within the Klingon-Cardassian Alliance during the 24th century. During the 2340s, she had a relationship with an unspecified Terran slave, the product of which was her half-breed daughter B'Elanna.
At some point, she was poisoned by her daughter, but was cured by a Klingon Doctor called B'Oraq. Neither woman found out about B'Elanna's involvement in the poisoning, though it turned the Doctor into an enemy of B'Elanna.
Regent Worf was known to lust after Miral, but since she disliked the foreheads of Klingons, she refused all of his advances. As a result of this, she was reassigned to become the Intendant of Earth in 2368. (VOY - Mirror Universe novel: The Mirror-Scaled Serpent)
She remained the Intendant of Earth until 2378. Although she was aware that Worf had intended the assignment as a punishment, she did not view it as such as it provided her with a ready supply of Terran males with whom she could indulge her sexual proclivities.
In 2378, Earth came under attack from a fleet of Memory Omega ships led by the Excalibur, which was under the command of the Xenexian renegade M'k'n'zy of Calhoun. At the time that the attack commenced, Miral had been holidaying in her beach house in the Maldives and immediately transported to the Klingon Consulate in Okinawa, Japan, which was built on the former site of the Kyoto Imperial Palace. However, upon realising the severity of the attack, she deserted her post and returned to the Maldives, where she was brutally stabbed to death by her sex slaves. Her last thoughts were of her disgraced half-Terran daughter B'Elanna, who had been missing since 2371: "I should have slain her in the womb."
The Memory Omega ultimately succeeded in liberating Earth from the Alliance. Upon being informed by General Goluk that Miral had deserted her post during the attack, Regent Klag sought to make an example of her by having her executed immediately and was disappointed to learn that she had already been murdered. (ST - Mirror Universe novel: Rise Like Lions)