The 48-year-old has remains in hospital following the crash on Pinehurst Line.
Police say the woman was speeding when she lost control of her car, which left the road and struck a hydro pole.
The driver was transferred to hospital in London with life-threatening injuries, but has since been returned to the Chatham-Kent Health Alliance for continuing care.
Her passenger, a 38-year-old Richmond Hill man, was taken to hospital with minor injuries, treated, and released.