Roberts denied the claims and said she was kept off the flight team because the service failed to meet financial objectives.
In December, the air transport service was $700,000 over budget and was providing 40 per cent fewer flights than anticipated.
"I think it was based on them losing money on flights ... I was shocked," Roberts, originally from Malaysia, said.
Her husband, Stephen Roberts, obtained internal emails and documents under the Official Information Act.
The emails, which the Herald on Sunday has seen, revealed Roberts' experience and knowledge had been an asset to the hospital. There was also no negative feedback documented during her training in Waikato or Hawke's Bay.
Tairawhiti District Health Board chief executive Jim Green denied Robert's situation was related to the troubled air transport service. He was unable to comment further.
The Department of Business, Innovation and Skills arranged a mediation meeting in February that resolved the issue confidentially.
The settlement was satisfactory, she said, but the experience affected her health and is forcing her to move home to England later this year.