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You can file a motion to compel the GAL to provide her report as ordered by the judge. However, you don't want to do this and have her throw punches at you for essentially complaining about the GAL to the court.
It may be best to appear for court and when the judge asks for the report, if you don't have it, you can simply state the fact that the GAL has not provided it yet.
This way, you can let the judge be the bad guy and go after the GAL for the report.