Selling the 'Big Issue' is a scam to get benefits. Once you are a seller you are classed as self employed so you qualify for 'In Work' benefits which ae far more generous than JSA. She and all the other sellers are claiming working tax credit, child tax credit , 100% housing and council tax benefit , free health care and more. The less they sell the more benefit they get.
Romanians seem to have cornered the market in this particular scam, the seller in our town is a Romanian as well as are all the ones in Cambridge.