I've been here from the start, and the first time I ever even heard of camerashy was after they had gone and people started saying it was Sandra. I assumed it was an in-joke like the PRISUS thing.
The backstory on why there was a whole thread dedicated to her - (sorry if you do know this) This thread is called part 3 for a reason. Between the 2013 and 2014 season a group of posters kept this thread very active, 2o-30+ pages per day. (over 49,000 posts and 2.5million views between parts one and two) Camerashy was one of them. The first two were locked due to size not due to arguing or nastiness.
She was looking forward to the 2014 season, and had joined the sweeps to support a person in the house. Then a week before the show started, about the same time the housemates went into lock-down she disappeared, and never posted again.
Of what little we got to see of the 2014 housemates Sandra's personality was the best fit for how Camerashy was on the forum, which was why that theory was there.
It seems somewhat fitting to all the people that made these threads for lurkers like me to read that a milestone like page 1000 and post 20000 on this threads about Camerashy and not about Big Brother!