Ms Girven said she was "a bit shaken" by the incident. "I closed the door and the other two ladies standing by me told the shoplifter she had to wait and not to treat people like that."
Ms Beran, of Clive, said the shoplifter caught her by surprise. She had just been "having a nosey" in the store when she found herself thrust into the role of granny vigilante.
"It was quite an experience. I was not aware exactly what was going on until I saw this woman push [the staff member]. We were all behind her. We were all making sure nothing would happen.
"You always think someone would come to your aid if you were in that situation.
"I think the grannies today are a lot younger than the grannies years ago."
Police Senior Sergeant Nick Dobson said the shoplifter, who eventually escaped the store but was later arrested, faced charges of common assault, shoplifting and threatening. She failed to appear in the Hastings District Court on Tuesday and there was a warrant out for her arrest.