The camp was used during World War II by the Australian Women's Army Service, a non-|medical women's service established to release men from duties at home so they could be deployed elsewhere.
Little to nothing was known about it until Ms Cooper began looking into it earlier this year. Ms Cooper wrote to Premier Colin Barnett in July calling for the controversial 5.2km highway extension to be aborted because the camp is about 170m from the Roe 8 Highway reserve.
She said further studies were needed to assess the full scale of the site and whether it impeded on the highway reserve.
Mr Barnett disagreed. In a letter to Ms Cooper, he said the road reserve's distance meant "the construction of Roe 8 does not have any implications for the women's army service site".
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READ NOWMs Cooper said the decision did not shock her, but she was adamant there was more to discover about the site.
Ms Cooper has received support from Cockburn Council, which called on Federal Environment Minister Greg Hunt to place the site on the National Heritage List while further investigations took place.
The City is also looking to include the camp on its Local Government Inventory and Heritage List.