Sophia had passed by the staff table..she had looked..and looked and decided that she felt the exact same way she did when the term started. She felt like sitting with her house.
So after a five minutes or less sat in her seat at the staff table Sophia made her way towards the Slytherin table and summoned her throne just as she had done months before, right at the head of the Slytherin table. Yep this was a good spot.
Also 100000 points for the headmistress with her handling of the miscreant.