Gymnastics Australia has the full details here.
The 15-year-old landed on an edge of a tumbling strip, forcing a short landing which resulted in a rupture of the ligament between the tibia and fibula (Tibiofibular Syndesmosis).
MLC Gymnastics has issued a statement here, including an update on Georgia's skills.
"... On vault, Georgia has made some good improvements with her double twisting Yurchenko, but this is certainly not ready for competition this year. This type of skill will take a long while to consolidate for competition readiness, and we are certainly not taking any risks at this stage in Georgia's development, but her sound improvement in the basics of this vault will certainly allow her a good platform for 2011."Very best wishes to Mary-Anne and to Georgia in these new circumstances.