Strong performances by Colleen Loach saw her 2nd and 3rd in the CCI4*-S; Team Australia had only one rider complete.
A selection event, and the only North American Nations Cup stop for eventing, takes place August 19-20 in Quebec
A keen young team won one of the most hotly-contested legs of the series among 12 squads, while some used the event as a tune-up for Pratoni.
Seven athletes and horses have been announced as team and alternate combinations for the FEI Eventing World Championships.
A heartbreaking spring saw the mysterious deaths of several horses on the property and the cancellation of their May horse trials.
The Canadian rider took the CCI3*-S and placed 2nd in the 2*-L with Super Nova at the popular event in Kalispell, Montana.
The 4* event just a month before Pratoni will be used as a testing ground and selection trial by many international teams.
Nations have begun releasing long lists of potential eventing combinations from which teams of four plus one individual will be selected.
Competing in the newly-added Advanced division, Phoenix placed first with Mighty Mouse and third aboard Tugce.
The squad have won team and individual prizes in both their appearances in this series so far and are coached by Olympian Andrew Nicholson.