Realistically, there's no way Katie will win. (Sorry Sam!!
)
Once the final two have been chosen, they're given placements within SA's company until all of the previous episodes have been shown.
Only then, with a couple of days before the final, is the winning candidate chosen. They film two seperate endings before the work placement, so they can just edit in the right one.
Therefore - SA's had time to monitor public opinion - there's no way he'd want someone working for him with such a negative reputation.
I hope Katie doesn't get into the final stages, as it'll be a no-brainer if that's the case!