She was last seen in the area of Route de la Hougue Bie in St. Martin around 17:00.
Hours later, she was officially reported missing just after 21:40.
Pictured: La Route de la Hougue Bie – the last place Elizabeth McDougall was spotted, according to Police.
The Channel Islands Air Search plane was called out in the early hours to assist with the search.
The thermal imaging-equipped 2CIAS aircraft was spotted circulating at less than 2,000ft in the area of St. Martin and Grouville for around two hours before returning after 04:00.
Pictured: The path taken by the Channel Islands Air Search plane.
Authorities are now focusing their searches around the area of Queen’s Valley. Police told Express they are also looking at the addresses of family and friends.
The air search came shortly after Police reported on social media that they were “concerned for the welfare” of Elizabeth McDougall.
This morning, they confirmed the search remained ongoing.
Officers said they had Ms McDougall’s clothing at the time she went missing, but said she was believed to be wearing a green parka jacket.
Anyone who has seen her or has more information about her whereabouts is urged to call 612612, selecting Option 2.