In 2382, T'Los exerted influence on the council to reject the council's attempt to decide whether to formally support the Unificationists. She claimed to act "to protect the Vulcan way of life," as the unification of the Romulan and Vulcan peoples would be "unpredictable."
In 2389, after the loss of the Jellyfish and Romulus, the Federation Council's investigation results regarding the Vulcan Science Academy's research of red matter and the Hobus supernova were released. T'Los gave a speech afterwards expressing regret if the Federation was harmed and promising that there was to be no further red matter research without the council's permission. To the Romulans, she said, "We grieve with thee." The councilor also chose to resign from the Federation Council as she felt "inadequate" to the job. (ST website: The Path to 2409)