Mrs Clarke was taken to hospital on Wednesday before passing away on Friday, with doctors unable to determine what caused her death.

It was initially suspected that Mrs Clarke had passed away due to typhoid, however blood tests revealed that the disease was not the cause of her death.

The family had been waiting for an intensive care unit helicopter to fly Kelly to New Zealand but she passed away before it arrived, going into cardiac arrest five times in the hour before her death.

Her family are now trying to raise money to help fly her back to Australia while Fijian authorities attempt to find out exactly what caused her death.

A former colleague of Mrs Clarke said she was always a positive person who would be greatly missed.

"Kelly was a truly kindhearted person who had a strong passion for helping others," they told Fairfax Media.

"Working with her was always a joy as she was always positive and brightened the room with her presence. We will all miss her greatly."

Mr and Mrs Clarke were married in April and had been in Fiji for their honeymoon and to attend a friend's wedding.

Mrs Clarke, who was a post-op nurse, became ill on Wednesday but simply believed it to be a stomach bug.

She was taken to Lautoka Hospital, north of Nadi, where a short time later she was told she had contracted typhoid.

She was placed into an induced coma and was reportedly in a very unstable condition.

Her mother had flown out to Fiji to meet Mr Clarke while her father and siblings remained in Australia.

The family are still urging people to contribute to the fundraiser for Mrs Clarke with the money raised set to go towards bringing Mrs Clarke's body home and her funeral costs.

A spokesperson for The Department of Foreign Affairs and Trade said in a statement that they were providing consular assistance to Mrs Clarke's family.

"The Department of Foreign Affairs and Trade is providing consular assistance, in accordance with the Consular Services Charter, to the family of an Australian woman who passed away in Fiji."

Fijian authorities will conduct an autopsy on Mrs Clarke's body, the findings of which will not be released until the examination is concluded.