if both kids are over 18 and both her and partner are working, i'd say they'd be getting minimum ftb for her kids as ft students - in which case the only thing that matters is what ATO consider income

if she is doing two diff party plans, she may get higher combined commission, but it may not be included for tax purposes as it's two diff ones kwim? i'm not sure - my accountant didn't use 6k as the number for commission, he talked about turnover and it was a much higher number (so incoming v outgoing - can't remember what it was now though)