UPDATE: Nicki Lee Cooper and Eva Lee Cooper have been found safe.
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Police are seeking the public's help to find a 22-year-old woman.
Nicki Lee Cooper was last seen at the Mandurah Foreshore around 11am on Tuesday September 17, 2019.
She is described as fair-skinned, medium build with blonde hair and blue eyes and was wearing a black t-shirt and black pants.
Police said she is in the company of three-year-old Eva Lee Cooper, and concerns are held for their welfare.
Anyone who sees Nicki or Eva should contact police immediately on 131 444.