depends how the grocery store managed their trash, but the dumpsters could be a cornucopia.
I knew a guy who I guess you could call homeless. He didn’t live in a traditional home, instead had a shack on an unused piece of property. He kept it up well and lived off the grid in a suburb. He was an expert dumpster diver and made extra money collecting scrap metal. He was pretty stable and kept himself busy. He became a Christian after reading a Bible he found.
I sort of admired his lifestyle and ability to make it. This lady sounds similar. She was employed, just found a way to not pay rent.