She was driving about 4.15pm when a stolen Mitsubishi Magna crashed into her Audi on Moore Drive, Joondalup, near Blue Mountain Drive. Both vehicles spun to the eastern side of the intersection, the Magna striking a power pole before the driver fled.
The woman was taken to Joondalup Health Campus with serious injuries before being taken to RPH.
The stolen car was later found burnt out on Glasshouse Drive in Banksia Grove. Witnesses are urged to call Crime Stoppers on 1800 333 000.