Is it wise to agree to a pay cut?

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We live in a neighborhood where lots of girls and even women in their middle ages do babysitting for career parents. I have a girl who confided in me recently about an issue she is considering and would want a response before month end. She does babysitting for a parent who is a doctor. The doctor works until about 6pm and she has to start babysitting from 8am to 6pm. She earns about 7,000 naira per week i.e 1,000 naira every day for three hours of babysitting. That makes it roughly 30,000 naira per month (approximately $100 dollars per month). The minimum wage here is 19,000 naira per month (about $50). So she is earning very well by her standards seeing that she only finished high school. She works hard at her job and also loves the twins. But recently, the doctor told her she wants to start a pay cut. Instead of 1,000 naira per day, she will be giving her 800 naira per day. One of the reasons she cited is that the girl eats in her home and she gives her transport fare to and from her home. The girl is distraught. This is a good paying job to her. She doesn’t know if to accept the pay cut or not. She is afraid if she accepts the pay cut, it might lead to further pay cut. What would you advise her? I have to give her a reply soon.