That is fucking awesome.
if she actually spent 4 hours every week looking for coupons then she would be making around 60 dollars an hour, ~240 dollars a week, almost 10,000 a year. that is all the money saved of course also only a rough estimate, i would guess it is more if she does that consistently.
so doing that makes saves her ~10,000 a year for only 4-5 hours a week, i'd say that is better than a job. and why not try to live off them if you can?