Her 55.050 all - around total would have been enough to take silver in the senior event .
The 13 - year - old Matthis , coached by Lorraine Atkinson , won the Australian Youth Olympic Festival title in January .
Matthis ' 55.050 all - around total would have been enough to take silver in the senior event .
The 13 - year - old Matthis , coached by Lorraine Atkinson , won the Australian Youth Olympic Festival title in January .