Jane is the next Elaine
The mantra has been established with the Board that the right experience for the CEO of Qantas Airways is LCC experience through Jetstar - that is why Jane is there doing nothing other than ticking the box, holding the fort and developing the public face that will make the progression seem uncontroversial.
Have a look at the role Jane played in the last visit of the Elaine and Jane show to the Senate - such frequent deferral was part of the plan.