Her death at age 73 states that she was in Victoria for 32 years.
Romaly
The first Victorian birth registration to this couple was in 1856 so she was in Victoria for at least 35 years at time of death.
Is this her death?
BACON Christina
Father Beer James Mother Sarah WRIGHT
73 years at Castlemaine 1891 Reg#14313
Births
PAINE Sarah
Father Richard Mother Christina KERR
At Kyneton 1856 Reg#13545
PAIN Jennet Jane
Father Richard Mother Christina KERR
At Kyneton 1858 Reg#13473R
KERR Jennet Jane
Father not recorded Mother Christina KERR
At Kyneton 1858 Reg#13473R
PAINE Christina Kerr
Father Richard /Mother Christina KERR
Born Kyneton 1859 Reg#15101R
KERR Christina
Father not recorded Mother Christina KERR
At Kyneton 1859 Reg#15101R
PAIN Mary Ann
Father Richard Mother Christina KARR
At Lauriston 1861 Reg#9368R
Death
PAINE Christina
Father Richard Mother Christina UNKNOWN
8 years born Victoria 1868 Reg#1477
Perhaps they never married.
Cando