AU/Crossover: Holly leaves Margate, not allowing Karen to go with her. A year or so later Karen spots ‘Holly’ (Rose) with a man (The Doctor) and sees that 'Holly’ has moved on from her.
Of course, this is Rose. If we’re saying that she and Holly are the same person, Rose isn’t actually Holly yet. Because this is Rose from 2005-ish. I’m going to say 2007 just to keep the ages about right (Rose is 19/20 here). I don’t know, I have a whole set of headcanons for this storyline so if you want to know just ask.