Tony Abbott's divisive former chief of staff has declared her support for Malcolm Turnbull but praised Bill Shorten and questioned government policy on superannuation in her first television interview.

Peta Credlin, who worked as Mr Abbott's top adviser in both opposition and government, began an interview on Sky News on Saturday by admitting "I'm out of my comfort zone."

Despite working in Parliament House for 16 years it was the first time she had set foot in the media wing known as the Press Gallery.

Ms Credlin, widely criticised during her time at the top for being too controlling, was largely unapologetic but said she was not perfect.