The woman was found by a member of the public on Waiwhiu Rd at about 7am on Monday with serious head injuries.
The Herald revealed on Tuesday that she had been bound and gagged.
Police appealed to the public to help identify the woman, who has a distinctive rose tattoo on her left calf with the words Mum and Dad written on it.
Numerous tips made to a helpline led to the identification of the woman and the location of her family who went to her hospital bedside.
Police have not released her identity.
Because the woman was unable to speak to police, witnesses were crucial in solving the case, police said.
READ MORE:
Woman in critical condition found on side of road north of Auckland
Tattooed woman dumped in gutter was bound and gagged