The victim left home on her motorbike at about 18:00 local time (12:30 GMT) 10 days ago to go to a doctor's appointment.
She called family later to say she had a flat tyre, and a lorry driver had offered to help. She said she was waiting near a toll plaza.
Efforts to contact her afterwards were unsuccessful, and her body was discovered under a flyover last Thursday.
Last week, three police officers were suspended when the victim's family accused them of not acting quickly enough when the woman was reported missing.