Bird dropping spider (Celaenia excavata)

This fat-bodied momma was clutching onto a sac of eggs about the same size and shape as herself.
She wouldn't let go no matter what caressings I attempted with a twig.
Abdomen estimated 16mm
This photo is upside down to help recognition.
The females often produce 4 or 5 sacs and curl up at the bottom of the chain.
Found on a medium sized shrub in a local nature reserve within inner suburbia.