After the events with the ancient magic in Cassiopia's 5th year at Hogwarts everything has calmed down a bit, she is still friends with the Sallow twins but Ominis is still disappointed in her. She can't blame him though, she didn't exactly stop Sebastian from looking farther into the dark arts, but she never lend him deeper into learning about it or using it. Cass feels bad even if it wasn't her directly doing anything, She never wanted anyone to get hurt from her tasks with the ancient magic especially not her friends. She had grown close with the trio of Slytherins but specifically grown close with Ominis, but after the events with Sebastian and dark magic, Ominis as well as Anne pulled away from her. She didn't blame them though, she understood why they weren't able to forgive her yet. Maybe when the new school year started they'd be able to forgive her and start a new chapter.
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