Presumably she got the brush off and rather than sit and wait she decided to take no risks
She decided to act outside of her training and company procedures designed, discussed and evaluated to prevent unsafe actions. Her actions were unsafe, unnecessary. The report makes it clear they had a SMELL of burning, no more, no less.
She'd have been crucified if the cabin had caught fire
No she wouldn't. While SOPs may in certain circumstances be inappropriate, which is why flight crew are generally intelligent and clear thinkers able to recognise that case, she would not be criticised for complying with the procedures in which she had been trained. If thick smoke or fire had been visible her actions could possibly be justified, for a smell alone they cannot.
90% of this thread is quite troubling, especially contributions from those who should know better.