I wonder what real reason for being removed was. It is not illness.
Possible:
Refusal of something, discipline. (Cut hair, refusal)
Secret boyfriend (Termination would be like s/mileage, false reason)
Tardiness, repeatedly.
Inability or unwillingness to study songs and dance properly
Bad attitude to seniors
Bad Grades in school
Accepting expensive gifts from fan
I think we may never know.