I'm pretty sure it doesn't matter in the least, and I really don't think anyone cares anyway. But since I'm gone, I guess I should write my characters out.
Alannah – Just disappears one day. It’s assumed she moved on.
Amber – Took NEWTS early and left after breaking up with Tim. She’s left no clues as to where she’s going.
Cassie – Dad’s job moved to US, so transferred to MACUSA University.
Caryn – Got expelled after the Truth or Dare party.
Emily – Left school due to bullying.
Jacinth – Killed in the line of duty.
Kerrigan – Moved to a different country with her mom.
Kyna – Committed suicide after being tortured by sights of past events and the unseen ghosts.
Lilli – Messed up some runes (or something) and is in St. Mungo’s permanently in a coma.
Portia – Was set up on a job, caught, and sent to muggle prison.
Sasha – Taken out of school by parents who didn’t like her loner personality change.
Abby and Blylthe were given to their original owners. Cecily was given away.