The 84-year-old is in a serious but stable condition after suffering serious head injuries and is scheduled to undergo surgery tonight.
Police say the unknown woman approached the elderly lady in a Midland car park, knocking her to the ground then leaving the area.
Detectives spent today searching for CCTV as they try to understand what prompted this shocking incident.
Officers have released an image of the alleged attacker.
She’s described as 160 centimeters tall, with a medium build, short brown hair and brown eyes.
She was last seen wearing a black T-shirt and black shorts.
