Forty-seven-year-old Barbara Algrim was driving a white car when she attempted to turn left onto Rockton Avenue.
She turned into the path of 42-year-old Annette Sheriff. Sheriff slammed into the passenger side of Algrim's car.
Algrim is being treated for serious but not life threatening injuries at Rockford Memorial Hospital.
Sheriff has since been released from the hospital. No one has been ticketed yet.