Regarding the porn career there are now at least four (or three) videos of Victoria with different timestamps in them, which validates them as real. I am not sure if i found them all, because they are sprinkled throughout the game and some of them we see only after very specific choices.
Since the timestamps were messed up in the last update i don't have visual proof readily available, and i have to play a recently downloaded Ch3Upd3 compressed version to have access to them again.
But so far, in case you and our fellow thread members take my word for it until i can provide those screenshots, these are the dates:
08. Jan 2009 Victorias casting video, from roughly 14:30 to 15:30, the colouring is greyish.
27. Feb 2009 Victorias supposedly second video, from ca 17:45 to 18:40, its the yellowish bukkake gangbang we see at the start.
24. Mar 2009 visually and thematically very close to the second one with a 17:05 timestamp, also yellowish with three men.
and lastly an again very likely mislabeled one
08. Jan 2009 11:37 Victoria partially undressed on a violet bed surrounded by two men.
as claimed in my post
here, i don't think the flashback video in Rosies second exhibition took place in reality, but this claim could be wrong.
As far as the timestamps go they are all located in the first half of 2009, that's why i concluded Vickys porn career was more a matter of months than years. Until a Video surfaces which has an 2010 or later timestamp, i will keep up my assumption.