Hi,
If she was still singing etc up until her marriage it may be listed under occupation on her marriage cert.
Also it appears her father came to Australia too as they had 3 more children in NSW
3712/1879 KEMPF AMELIA ETTIE JOHN OLIVIA FLORENTINE SYDNEY
2104/1881 KEMPF HILDRED JOHN OLIVIA SYDNEY
2105/1881 KEMPF VIOLET JOHN OLIVIA SYDNEY
Kellie