TheBeliever11
The Believer was always watching her brother through his own mind. She hacked into his mind because she wanted to know if he was safe but it soon came to her attention that she'd have to go against her brother in order to save herself.
After being so lonely with just herself, her TARDIS, and her comatose husband, she finally had the guts to settle down and let her story continue as she waited for her brother to be there for her, or to at least know that she survived and was well.