Anomalous Readings (Doctor Who) by Calapine
Jenny stumbles into a TARDIS that doesn't belong to her father.
Out of the Dark (Doctor Who) by AstroGirl
Jenny finds the limits of the universe, and keeps right on going.
Run (Doctor Who) by More-than-words
Jenny runs in space, but she wants to run in time as well. The Doctor runs when and where he wants, but it doesn't stop his loneliness. Then their paths cross unexpectedly, and they find themselves working together to save a civilisation. S4 spoilers.
Shaped by Our Futures (Pretender/Doctor Who) by AstroGirl
Jarod and Jenny; saving the world with an awful lot of running.