How she looks really depends on which incarnation of the Doctor manages to find and help her, and then which companion she gets attached to and starts to mimic. So I’m saying the Tenth Doctor, around the time Martha and Donna were in and out of the TARDIS. This way, she misses the Master by a month or so, so she wouldn’t end up in a cage with the ancient Doctor and end up even more traumatized than she already is. Helping her deal with all the problems she has while in the TARDIS, on Martha and Donna’s orders, before anyone even thinks of doing a lot of running away from aliens. Or even going into a single dangerous situation.

I considered having her with the Eighth Doctor instead of the Tenth, but she really doesn’t need to get dumped on another planet while he goes off to the Time War. Martha would likely be her regular guardian, and when she left the TARDIS they would stay either at Francine’s or at UNIT. Thus keeping her away from most of the pitfalls of the Doctor’s life, with only a few trips in the TARDIS if Meggan and the Doctor teamed up to beg with huge puppy dog eyes.

PB: Hayley Westenra