I think you're glossing over a few things here.
Gina may employ around 4000 people, but she is also doing her best to lower working conditions for everyone - she is a major backer of the LNP, the IPA, and has made statements wishing Australia's employment conditions were more like parts of Africa, where people are willing to work for $2 a day.
Not sure why she thinks everyone except her should work for peanuts, given her wealth has increased from the poverty line of $75,000,000 she inherited in the 90's to around $40,000,000,000 now.