An. Sorry for the long wait, but hopefully this makes up for it. Some of the lines have been based/borrowed from the sound of drum episode.
Her story.
Rose was in shock how did she have two hearts it wasn't possible there were no Timelords or well Timeladies because everyone had gone to fight in the time war even Timelords in parallel universes.
Flashback: TARDIS kitchen
Rose sat down opposite the Doctor but she wasn't looking at him rather though him deep in her thought and it was worrying the Doctor she hadn't talked in well, since Mickey had left, which was why he felt it necessary to interrupt the silence. "Rose, Rose?" Rose shook her head and none the less replied "yes Doctor" her voice was hoarse and dry which just made the Doctor fell worse. "Rose tell me wants wrong." Rose made no more to talk, "Rose please tell me." Rose looked up at the Doctor her eyes full of tears "His gone. Why'd he stay there?" "Rose he feels he can make a difference and Mickey's a big boy and he can look after himself. He'll be fine." "How do you know that Doctor?" The Doctor sighed and closed his eyes "Timelords could once travel between parallel universes easily. But not now, every Timelord from all universes went to fight in the time war."
End of Flashback.
"Rose calm down, breath, that's it." Rose had now calmed down enough that she could talk even though it was no much of an improvement, because all she said was "Impossible." The woman smiled "So Rose Tyler, yes I do know your name, would you like to know my story? About my life, about why I am here?" Rose nodded her eyes lighting up with a thirst for knowledge. "I was born in your universe on Gallifery I went to the academy with your Doctor; he was a good friend as I'm sure you know he married a woman called Omicron" The woman waited till Rose nodded. The Doctor had told her about his first wife and his children soon after they became a couple. "Well she was my sister. On to other things I was interested in parallel universes so I spent a lot of time travelling between multiple universes. However like everyone else I went back to my home, Gallifery when the call to war sounded." She paused in deep sorrow "But unlike your Doctor I ran away, when the burning started I ran so far away, so far away that I forgot myself. I turned my self human so they would never find me because I was so scared. I set my TARDIS so that she would drop me off here and then leave and hide on Earth 59th century so that if I was found they could never make me leave because you needed a TARDIS to leave."
Rose tilted her head to the left, "How did you get your memories back?" Rose asked knowing that something needed to trigger the memories before you even felt the need to open the fog watch; The Doctor had explained this before they were separated. "I heard people talking about how devastating the time war was and then I woke up here, with no way home even when the void was opened. Though I doubt that Gallifery is still there for I can't hear anything in my head not even a hum of a TARDIS but if we can get back to our universe then hopefully that space will be filled up by your Doctor and you" Rose nodded remembering how the Doctor had explained how lonely it was to not have the voices of his people in his mind and how much it had felt better having her in the back of his mind when they had got married. That thought let her to ask "Why do you call him my Doctor?" The woman smiled as if she knew something Rose didn't "Because you are married are you not? Which probably means you have, well when you were with him a mental bond to him which to Timelords means you are his till you die and he is your till he dies." Rose felt hope for the first time in years maybe the Doctor had no forgotten her. Seeing the look of happiness on Rose's face the woman laughed "Oh and by the way my name is Hemera."