EmilyAberdeen
Since The Doctor forgot Clara he couldn't stop trying to remember her between all the adventure. Until he decided it was time to move on, that's when his daughter turned up and the search for Clara began.
All right belong to the BBC and Doctor Who with regards to the characters, especially the prologue which is a direct transcript from the last episode of series 9.
Please don't copy my ideas.
P.S
Jenny is aware of Clara because of my other Doctor Who novel, One By One.