Is the bully at fault?

We have a main denominator at work who always gets away with whatever she does even when reported. Last week, we had a major conference at work and this was a big thing because this meant extra commission from upgrade programs, cancellations and early departure fees. To cut the story short, this person decided to start a report early, which is normally done at night (around 6pm). This person started doing it at 12pm so she can start charging the accounts. Needless to say, she made about $80k in postings that week while taking away the responsibility from the PM team. That person will be getting 17% from that number while the PM team, which included myself and a few more people, get hardly anything. Is this ethical? We have reported it to management and they say there is nothing they can do?

This person always gets away with anything. They are always late for break, they say it is too much work to change simple details to a group of reservations and claims her hand hurts. They cancel vacations late and many MANY more.

Are we able to report the greediness of taking everything for herself? I feel like management will still not back us up.