I find School Reunion to be contradicting, one minute Sarah is all "I thought you died!" and the next, "I knew you were on that Spaceship over London at Christmas."
But then, I suppose if you haven't seen some one for thirty years, you'd become emotional too.
(Although, she must have known he can't have been that dead, I mean, he sent her K9 around 1981)
And as for the audios, well, I don't take them to be canon, but rather take certain aspects of them to be canon
(and warning: potential spoilers ahead)I believe that Sarah did know two people called Josh and Nat and did some investigation type stuff with them, Aunt Lavinia has died, Brenden now lives in San Francisco, Sarah sold Morton Harwood, Harry went out to sea and has not been seen since and I'm even willing to accept that Sarah is part of some Doomsday cult (well, some of the time).
But as for Dreamland? It never happened in my fanon.
Although, it may have happened to an AU Sarah, which I'd be more willing to accept.
That's partly what I love about this fandom, it's so open to personal interpretation.
MAKE TEA. NOT WAR