As her career matured and she gained confidence, Hardin became known for painting complex works that combined colorful images and symbols from her Native American heritage with modern abstract art techniques. Her work frequently incorporated images of women, chiefs, kachinas and designs from pueblo pottery, and integrated modern elements as her career advanced. For instance, the paintings of kachinas and blanketed chiefs integrated geometric patterns made with drafting templates, rulers and protractors. Kachinas, or heavenly messengers, had special spiritual meaning, similar to the saints from her Catholic tradition, connecting between people on earth and heaven.