How does the "Toughen Up Princess" email and the associated Jetstar comment regarding fatigue fit into this?
It doesnt. There is no such thing as fatigue at Jetstar. If for any reason you cannot complete your duty, pay is deducted. In order to pay the mortgage you are forced to a) lie about the reason by applying for sick leave (if you were actually fatigued) and b) use up your sick leave to compensate for poor and inadequate flight and duty limits.
Despite them bleating on about an open reporting culture, there is no formal procedure for claiming fatigue, no one does it, no stats are captured and ergo there is no fatigue at JQ. Just the way they like it.