Before 2038, she was involved in a relationship with REF soldier Locke. They were separated when he was ordered to be a part of the first attempted attack on the Invid Hive at Reflex Point. He promised that they would see each other again, and she joked that if they didn't, she would come looking for him.
Years later, in 2042, Tasha was deployed in part of a mission to help Resistance groups on Earth and to investigate if the Invid had actually been able to make Human-looking spies. She followed the tracks of the hybrid, along with Xed.
She eventually came across a group of female fighters, consisting of Maria Allentes, Anna, and Vera. They stole the H-109P Destabilizer from Dr. Osmund, and managed to penetrate the Hive wall at Reflex Point, where they witnessed the Invid spy enter after them. They decided to ambush him, and Tasha was horrified to realize that the spy was her past lover. Xed entered, and told her not to kill him, saying that if she did he would kill her.
Accounts differentiate on what occurred next. According to one account, Tasha killed Locke, and fought off Xed with Maria. Xed fought Tasha in a Shadow Fighter mech, but was killed by her as the Invid Regess left the planet. Tasha decided to keep looking for her ex-lover, despite having just killing him, living a lie in order to have a purpose.