This is just an idea I had. I hope you enjoy it!
Disclaimer: I own nothing!
Clara sat on her bed, thinking. It had been a long day, and she didn't really know what she felt about all that had transpired. She was tire, confused and a little bit hurt. The young man she had traveled with, who she had grown to care for, had changed his face completely, had turned into an old man, and had even forgotten how to fly the TARDIS for a moment, and then they had crashed onto a foreign planet. The Doctor (was he still the doctor?) had told her not to worry and that he would have everything all sorted out in a jiffy. So Clara had excused herself, saying that she was going to go to bed, and so here she was, sitting on her bed, thinking.
"Nice place you've got here."
Clara jumped and turned around. There was a girl there, a blonde girl.
"Who are you? How did you get in here?" Clara asked.
"You know," the girl said as she walked towards Clara. "You handled this a lot better than I did.
"Handled what?"
"When he regenerated with me, he accused him of being a slitheen." She was smiling now.
"A what?"
"I thought that there was no way this new man could possibly be my Doctor. But he was. He's always the Doctor. No matter what he looks like, he's the same man." She paused "He's your new, new Doctor."
"New, new Doctor?"
The girl smiled.
"Who are you?"
"No one important." The girl sighed. "Please Clara, please promise me you'll look after the Doctor. It's not good for him to be a lone."
"Yeah, ok, I promise."
"Thank you." The girl sighed. "Goodbye Clara. Maybe we'll see each other again someday." And she vanished, like a ghost.
Clara left her room, in search of her new, new Doctor.