Despite four requests to attend a disciplinary meeting, including a final request in which Ms Wilson was warned she could be dismissed, Ms Wilson failed to attend. She was dismissed in April last year.
Ms Wilson brought a personal grievance case before the Employment Relations Authority, arguing she had been unjustifiably disadvantaged and dismissed.
She also sought compensation for hurt and humiliation.
But the Authority dismissed Ms Wilsons' claims, noting Pet Stay had given her the opportunity to respond to the allegations, but she had failed to attend.
It found Pet Stay's decision to dismiss Ms Wilson was fair and reasonable in the circumstances.
Ms Flavin told APNZ she was shocked when a client asked her if Ms Wilson was leaving - and then told her about the radio interview she had heard.
She then decided to request a transcript from More FM.
In the phone-in interview, Ms Wilson said she was really unhappy in her job and hated going to work.
Ms Flavin said the business was directly identifiable by Ms Wilson's comments, and more than one client had heard the interview.
"The hosts actually said to her, 'We're not going to get you fired by talking about this, are we?"'
Ms Flavin said the interview was not the main reason she dismissed Ms Wilson, and it was mainly due to her attitude.
She was disappointed by how the employment relationship came to an end, but was pleased her process in dismissing Ms Wilson had been vindicated by the authority.