I am not sure what her Thyroid is good means. I would need to know her TSH to see if this is an issue. I would continue to work on circulation with warming circulatory stimulants such as cinnamon, ginger, prickly ash. She could also be iron deficient (check ferritin). Trying one herb i.e. Red Ginseng, is unlikely to be effective. First a thorough assessment needs to be done, to check possible underlying causes and then a treatment plan can be created.