Sequential compression devices are expensive but helpful. Otherwise massage from feet up or get one of those stretchy big rubber bands people exercise with and starting at feet wrap tightly around feet up to below knee. You've prob. tried TED hose. Elevate feet above the heart. No salt. No sitting in chair with feet in dependent position. She has to have some disease or pathology behind this in addition to age. Is the edema pitting, or painful and equal on both sides?