The Impossible Timelord

A girl. All alone, with no one in her life. No one knows who she is. Sounds awful, doesn't it? Meet The Doctor... I'm sure everyone knows what he's like. What will happen when The Doctor finds this girl in the street? Will she trust him enough and his promises of a better life? Or will she run away from the strange stranger with the bow tie and continue her life like she doesn't even exist?