She was just four months shy of her 18th birthday when she vanished.

One of five children, she had a close relationship with her family, but was known to be shy around strangers.

Hayley and a friend travelled to Dongara on July 22 with the intention of staying there and working for a while.

The day Hayley went missing, she made the decision to catch up with family friends on their farm between Badgingarra and Moora.

Police say she was given a lift into Badginagarra by a yellow Scania prime-mover.Between 10.20-10.30am she was dropped off at the Badgingarra roadhouse.

She made a phone call from a nearby telephone box and bought potato chips and a bottle of water from the roadhouse.

Between 10.45-11am it's believed Hayley was given a lift by a woman to Winjardie Road, about 11 kilometres east of the Brand Highway.

The woman dropped her at the intersection of Winjardie and North West roads.

Subsequent sightings between 10.48-11am have placed a young girl, believed to be Hayley, standing on the northern side of North West Road at the corner of Winjardie Road.

Witnesses also described seeing a young girl on the North West Road, approximately 5km east of the Moora and Dandaragan Road intersection.

This person was seen kneeling down on the road verge rummaging through a backpack. Hayley never made it to her family friend's farm.

Her mother Margaret Dodd reported her missing the following day.

She is still missing.