GSB council and Ms Wisby have been the subject of constant controversies over the past six months.

In January Ms Wisby had harassment allegations levelled against her by the Australian Services Union.

More recently the council was issued a performance improvement direction after an independent review found it was not complying with the Local Government Act.

"I have been worn down by constant criticism and lack of support from the Local Government Division and the unfair criticism of an orchestrated few, both inside and outside the council office," Ms Wisby said.

"My position has become untenable; my health and wellbeing have been severely impacted."

She said the council inherited a situation where statutory records were not kept and lamented the governments handling of the performance direction.

"While council had no issue with the PID, it was very disappointing that the process was managed through a ministerial media release," Ms Wibsy said.

Speaking today Local Government Minister Mark Shelton said the GSB council had responded to the performance directive.

He said the government was in the process of assessing the response and was aware of Ms Wisby's resignation.

"I wish her well as she is stepping back from the role of Mayor in public life. We all know these are not easy jobs and looking after one's health must always come first," he said.

Multiple councillors said some elected members didn't find out about the Mayor's resignation until after it had been reported in the media.

A byelection will now be held to appoint a new mayor and councillor.

Cr Cheryl Arnold, who ran for Mayor at the last election, said it was too earlier to comment on whether she would nominate for the vacated position.

Sign up to one of our newsletters: