Sophia wanted the seat between Leobald and Seren, thank you very much. She was leaving right after the feast so she wanted to get as much time with her bestfriend as possible and therefore her place at the table was very inconvenient so she threw looks at Leo.
Couldn't he swap seats with the potions professor? That would lovely. And he was out so long it was obvious that he needed a haircut again.
She took time away from trying to get Leo's attention by glancing across the hall, just to make sure everyone was seated and not roaming cross tables.