Im pretty sure they use the old 'round' point previously used by the ITF for $25K's
1st round - 1 Point
2nd round - 3 Points
Q/Finalist - 6 Points
S/Finalist - 10 Points
Runner Up - 15 Points
Winner - 21 Points
This given the case there are 7 other Aussies possible of still winning the wildcard. Although the chances are remote however still feasible.
Trudi Musgrave - R/U, 1st, 2nd, W = 40 points
Bryanne Stewart - Q/F, 2nd, Q/F, 2nd = 18 points
Monique Adamczak - S/F, Q/F, 1st, 1st = 18 points
Evie Dominikovic - 2nd, 2nd, 2nd, 2nd = 12 points
Mireille Dittmann - 1st, 2nd, 2nd, 2nd = 10 points
Lauren Breadmore - 1st, 1st, 2nd, 1st = 6 points
Cindy Watson - 2nd, 1st, DNQ, DNQ = 4 points
Christina Wheeler - DNP, DNP, DNP, 1st = 1 point
For Wheeler to get it she would have to win Nurioopta and Mt Gambier and have Trudi Lose 1st round in both events. Then Wheeler would have 43 points and Trudi 42! Watson/Breadmore would have to win both as well with Trudi losing in a 1st round of one event and 2nd round at best in the remaining challenger. A final and a win for Mireille and Evie would get them across the line if Trudi did no better than a 2nd round and a Q/F in her final two events. A S/F and R/U finish in the final two might be all Monique and Bryanne need as well if Trudi loses both 1st rounds.
All in all its unlikely that Trudi won't get the wildcard. Probably Evie has the best chance to knock her off if she can get her head into gear!