She is talking about the sacrificial killings at the Royal Cemetery of Ur. The king was buried with a lot of his retainers in a complex layout that imitated his everyday floor plan—guards and all.
Not a whole lot has changed in the last 4,000 years, has it? We still try to get to the divine by sacrifice—we call it something else, like self-denial, or the like. But, the bottom line is we are still trying to earn salvation! It won't happen. Now how, no way. We can never earn it. It is a free gift. Accept it, live in it, and rejoice in it.