Ava was a Year 8 pupil at Notre Dame Catholic College in Liverpool.
Its headteacher Peter Duffy said: 'She was an incredibly popular girl, with a fantastic group of friends.
'Our deepest thoughts and prayers go out to Ava's family and friends and all those affected by this utterly tragic event.'
Colin Parry, whose 12-year-old son Tim was killed in 1993 when the IRA bombed Warrington, has revealed he had awarded Ava the title of Peace Ambassador after she attended a charity course in 2019.
'What a tragic loss for her family,' he wrote on Twitter. 'Our Peace Foundation will be at her school again on Monday.'...but does amyone think their history, background and potential, should it ever be revealed, will match that of little Ava's?