Caldwell is an active member of Unite For Strength, the Screen Actors Guild coalition in favor of joining with AFTRA. On September 19, 2008, she won a seat as an alternate on the national board of Directors and Hollywood division board of Directors. Caldwell was elected to a second one-year term September 24, 2009. She served on the Seniors, Legislative, Women, Holiday Host, Honors and Tributes, and EEOC committees. In September 2010, she was elected to a one-year term on the national board of Directors. She served as the national chair of the Women's committee. In 2011, Caldwell is on the SAG national board of Directors ballot for a fourth consecutive year. She won a three-year term on the national and Hollywood boards. She will serve as national chair of Women, and Health care Safetynet committees.