Mark,
The direct link between hormones and IBS-D is not clear, however, we do know that higher levels of progesterone can decrease or slow bowel motility so women may notice some issues with constipation in the luteal phase of their cycle. Low, high or fluctuating estrogen levels may also contribute to bowel issues. The link between fluctuating bowel issues and hormones is there but a direct cause and effect relationship has not been determined. My suggestion is to address adrenal and hormone issues as best you can with each patient while working on the IBS. This will only serve to increase your chances of making progress with with the IBS and improving the overall health of your patient.
The low DHEA may be consistent with the aging process. Supplementing with a low dose of DHEA may support her levels but because of her high normal testosterone, you would have to dose very conservatively. The BioMatrix sublingual DHEA would be a good option because the drops are only 1.2 mg per drop. Maximum dosage would be 2 drops twice daily and you would need to monitor her DHEA and testosterone levels. Her overall adrenal function is low normal and a well-chosen adrenal support program is warranted – pregnenolone, adaptogenic herbs, minerals, and nutritional support are warranted.
I suspect that once you address the candida, digestion and elimination, her overall symptoms will improve in terms of her gut issues. Given her age and where she is in menopause, the management of her hormonal symptoms will require reassessment and modification of her treatment program as she progresses through the stages of menopause.