It happened while she was walking her dog with her older sister in far north suburban McHenry.
Lola Cassidy says they walking along a bike path and started to cross the street when the driver hit her.
Cassidy flew over the car and suffered a concussion, cuts, and bruises.
Police say the driver hesitated before speeding away.
"I wanted to go to the sidewalk, and I started walking over there with my dog, and then I saw the car coming so I started running," Lola said. "A lot of people are saying I was brave."
Police are searching for the hit and run driver who was in a dark green colored sedan.
Anyone with information should call McHenry police.
