Her burial was pushed to May 6, so that Margot could be with her loved ones.
Robbie opted to skip the traditional black attire for a white summer dress.
Her husband Tom Ackerley, who she married in Byron Bay in December 2017, didn't seem to be in attendance.
Margot was raised by her mum, Sarie Kessler.
She and her siblings Lachlan, Anya and Cameron spent a lot of their earlier years at their grandparents' Currumbin Valley property.