Vexylüp school of witchcraft and wizardry

Nia Hega was a normal girl with a kinda normal life until she got her letter to Vexylüp school of witchcraft and wizardry. Her parents left Her and her sister to their grandmother once they found out They were both witches since Their grandmother couldn't take care of them both she sent antonia to her aunts home to live with her Though she still visited her sister and grandmother.nia's aunt was a witch and animagus at the same time,she kept it from her sister who is nia's mother.Once Dennis nia's bestfriend announced that he had to 'move to another school' so suddenly made nia very unconvinced that he actually had to move. After she got her letter what happens???