Knyla Shen

 contacted the Time Lords after the Time Freeze was broken. She was able to bias the interception protocols to contact Dalia directly. She was part of the resistance. Eris told her of Rassilon's plans to destroy the planet and that Romana II planned to evacuate the planet. She created a resistance group with Eris not just on her planet, but a resistance against the Last Great Time War. This changed Rassilon's plan to erase the planet completely in time. Dalia ordered her to make sure that all of those where evacuated quickly. She made sure her resistance signal was still transmitting even if the planet didn't exist. She didn't make it to the TARDIS on time and was erased from time. Her death made Eris go renegade. (AUDIO: Collateral)