Nancy Grace is livid at Casey Anthony -- slamming her new legal advocate gig as a shameless cash grab and insisting the focus should remain on her murdered daughter, Caylee.

Casey Anthony, who was acquitted in the murder of her daughter about 15 years ago in Orange County, is using TikTok to promote herself as a “legal advocate.”

Casey Anthony gained national notoriety after she was accused and acquitted of the 2008 killing of her 2-year-old daughter Caylee Anthony.