But in a letter dated yesterday, DHB chief executive David Meates said the staff member denied the accusation.
She explained that she had considered whether to talk to Mrs Partridge in the supermarket, and whether it was appropriate.
"Knowing Mrs Partridge's "very difficult journey" she thought she should, and that would be a "the more caring approach".
She strongly denied making the gesture or noise described.
The staff member was caring and professional, and sincerely apologised if the conversation caused offence, Mr Meates said.
Mr Meates said the staff member's distress at the thought "she might have added to her distress is genuine".
"I hope you will accept her apologies and assurances."
Mr Meates said he would not be taking the matter further.
Mrs Partridge said today her subsequent inquiries found the alleged incident was not caught on the supermarket security camera.
- The Greymouth Star