I don't think the judges have much sway over who goes home each time. In every season of DWTS some low-scoring couples still made it back the next week because the fans voted for them. And some who ranked high in the judges scores still went home. In Audrina's case, the fans just were not there.
I think Audrina is a sweet, pretty young woman. But, IMHO, I have to agree with the judges here. She just didn't have any personality. That hurt her in the end -with the viewing audience.