The incident happened on the R355 Eyrecourt to Ballinasloe road, near Lismany, Laurencetown, Ballinasloe.
She was the only occupant of the car.
Gardaí are appealing for witnesses to contact Ballinasloe Garda Station on 090 9631890, the Garda Confidential Line on 1800 666 111, or any Garda station.
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