She was my last traveling companion. Because of my mistake, she was turned into a Cyberman, but just like Oswin, she was strong. Amazingly strong. She was one of the best. She fought against what was done to her, and retained her human emotions.
It hurts me just to think about it.
To save people from being captured and upgraded by Cyberman, we fought against them while my other companion, Nardole, helped the people escape. After they were defeated, I don't know what happened to her.