UPDATE: Nicki Lee Cooper and Eva Lee Cooper have been located safe and well in Perth.
Nicki was last seen at the Mandurah Foreshore around 11am on Tuesday, September 17.
She is described as fair skinned, medium build with blonde hair and blue eyes. She was last seen wearing a black t-shirt and black pants.
She is in company with three-year-old Eva Lee Cooper and concerns are held for their welfare.