Say that $1600/wk is perfectly livable for her. That means formerly, she was working at a job that did not pay her enough to live, but she was forced to because the alternative is worse. Arguably, for many people, they could live on even less than that.
Countless people who are forced to be in the job market, slaving away at crappy jobs at the threat of poverty and homelessness. They are forced to be at jobs they hate, propping up industries that survive only because of exploitation of human labor, and they don't even get a proper living wage from it. Human life is very limited. Time is the greatest asset we have and it goes away even when we do nothing. Yet we force so many people to trade their time for a pittance.
If these people were provided a base amount of money they could live on and do something else, then those jobs would either be unfilled (and the industries die off) or the businesses will be forced to raise the wage, thus providing more money to people who are willing to work for it.