Sometime prior to 2371, Ione lived on the planet Deneva; Elieth, son of Tuvok and T'Pel moved to Deneva to persuade her to marry him. The two wed sometime while Tuvok was lost in the Delta Quadrant aboard the USS Voyager (between 2371 and 2377).
Initially, T'Pel was hesitant towards Ione, but her sophisticated telepathic skills helped matters along, and respect and acceptance was finally granted once T'Pel realized the great contentment and peace of mind Ione seemed to bring to Elieth, whose logic had long felt troubled during his youth.
During the Borg invasion of that year, the Deneva president gave an order to evacuate the planet before the attackers arrived; Elieth and Ione stayed behind to assist the Deneva Civil Defense Corps. Her role had been to lend her skills as a particle physicist to improve the city's defensive shields, allowing more time for their transports to escape. After the last transport left, Ione hopefully considered that they might have been able to leave with it; Elieth responded that there had not been, and they were not a priority for evacuation. As the Borg struck the planet, Ione asked what he would miss most, and Elieth responded that once he no longer existed, he would be unaware of any loss. Ione cried lightly, and said she would miss him, and his emotional facade cracked, so that she knew he loved her as they perished. (ST - Destiny novel: Lost Souls)