Kylee was the Doctor’s companion. Not now, now he’s gone. He left her. He doesn’t remember how they met, he doesn’t remember their adventures, her voice, her name. She’s gone out of his memory, completely. Not even a little speck of knowledge about her remains. And, she can’t do anything about it.
She traveled a year with the Doctor, then, blinding lights, laughter. It all filled her head. They were crashing, and the Doctor. Well the look her gave her. The look of confusion. The only thing he remember is her tearful eyes. After the crash, Kylee woke on the streets. Dazed and confused, that blue box gone.
So now she lives in a Homeless Shelter in London. She spends most of her time working in the kitchen and searching for the Doctor. She still holds on to the TARDIS key, which she wears about her neck as a necklace. She is human and not all that exciting.