The assault was captured on surveillance video, showing Mary Rutkowsky getting knocked to the ground outside the store on March 8.
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Rutkowsky was seen leaving the store with her daughter when a man standing near a flower display hit her on the head.
"I want to know why?" said Rutkowsky. "Why he would pick me of all people? I can't understand why anybody would hurt another person, especially an elderly person."
Rutkowsky's daughter, Annette Stewart, turned around to help as the suspect walked away pushing a wheelchair.
"She just kept saying, 'He hit me! He hit me!' and I said, 'Who?'" said Stewart. "The (grocery store) sacker, who was pushing our groceries out, pointed to the guy, and said he was the one who hit her."
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In the video, a black bag was seen near Rutkowsky's feet, which is believed to belong to the suspect.
Police say they have not made any arrests yet, but believe the suspect has a prosthetic leg.
Authorities are urging anyone with information to contact police.