A number of points here;
1. While your firend may not want to 'fight this battle', it is not her choice. The employer cannot decide that she is not an employee. She is an employee, full stop. If she agrees to the illegal arrangement, she is colluding with the employer and leaving herself open to possible court 'battles' down the road if she is caught/reported.
2. What happens if she has an accident at work? she will not be covered by insurance.
3. You say she is on JA for a year. If she had previously PRSI and was on JB which exhausted, the 12 weeks work as employee would probably requalify her for JB, which is not means-tested. She would also be adding contributions to her pension entitlement, other SW entitlements down the line.
4. What is going to tell SW? They will want to know details of work, employer, etc.
My advice is to tell SW that she is employed and give all correct details. She does not have to 'fight the battle' with employer. If he does not legally comply with the law, then he can be reported to SW and/or Revenue after she leaves!