[the_answers]

She made an educated guess.

She knew Dexter wasn't really in it for his "journey" and he would take the lowest of the lot. (and everyone else would go very high which even Dexter implied he knew himself on the clips)

She even questioned his "gameplaying" on the HL last night.

I even predicted Dexter would take the lowest myself when it was going live on twitter.
Not too difficult to guess he would !