The 26-year-old was arrested on suspicion of assisting an offender following the murder of 16-year-old Leonne Weeks, whose body was found in Dinnington on Monday night.
The woman was held on Tuesday and Wednesday before being granted bail last night.
An 18-year-old Dinnington man arrested on suspicion of murder on Monday remains in police custody.
Leonne, who was studying at Doncaster College, was stabbed to death.
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Anyone with information should call South Yorkshire Police on 101.