What programme is she from?
Unless she has done the additional Honours year, Australian three year Bachelor Degrees are not classified into Honours.
Even if you get a CGPA 4.0 and WMA 85 or you get a CGPA 2.0 and WMA 50.0 you still get the same Pass Bachelor Degree.

Anyway most Honours in Monash are awarded according to the Weighted Average and how it is classified differs according to faculty you would have to check the specific programme.Automatic Honours are only for programmes that are 4 years in length or longer. 3 year programmes need to undergo 1 more additional Honours year which can only be undertaken upon invitation by the Uni so you need to have decent results for that.

and mostly after surfing through several of the Monash faculty websites on Honours it seems mostly a credit average is needed for the lowest level of Honours with some the specific average changing from year to year based on some formula and some setting it at a credit average of 65% etc. check your faculty webpage to see specific info on it. Usually lower than those you get a Pass Degree like any other that didn't undergo Honours year.