This long-time Liberal says she needs to step down till she learns to play the game. 
She's probably competent in many things, but speaking for her government is not among them. 
 
Having said that, the Liberal committee rep has it right:  a large majority want change but in a referendum they will vote against anything they don't understand.  Trump kept it simple and won the change vote; it may be impossible to pick one PR system and explain it simply ... and the more you tweak it to make it even fairer, the more complex it gets.