if she wishes to keep everything 'above board' then she should declare this to the benefits office. If she is entitled to earn this amount as well as continue to receive her benefits then there is no problem. The Benefits Office will advise her legal rights accordingly. If she does not declare the earnings and if not entitled to the full amount of benefits but continues to claim them, they may perceive that as Benefit Fraud and can stop all of her benefits until the amount is repaid.