Issue with Part Time Work

Just wondering if anyone could advise on an issue my friend is dealing with.

The past year she was been working part-time and was getting three days a week which was fine.

A few weeks ago she had a disagreement with the person doing the rota who is now making life impossible. Once you work four days a week you are classed as not working part-time and receive no payment from the social welfare.

So what is happening is she is giving her four days a week and less hours per day. In effect my friend is now working for 20+ hours for a couple of euro extra a week.

The person is ticking the box saying full-time work was available that week when it was not, she is told to come in four days a week for 6 hours.

The person also wrote a comment on the slip you hand in saying my friend had the option of a days work but rang in sick.

To be honest my friend went through a bad time recently and she probably created these problems for herself.

I don't know if what the person doing the rota is doing is legal i presume she wouldn't be otherwise she wouldn't do it.

The big issue for me is writing a comment on the sheet which to me seems like an act of bullying.