I can understand why this would be awkward and I wouldn't be comfortable either. Maybe you can try saying, "honestly this is something you need to speak with your doctor about". Really she should speak with her doctor - maybe he/she could change to a different med which doesn't have those side affects. Also due to her menopause there are solutions like estrogen creams or even she could be low on testosterone because women have this hormone too, which affects libido. Keep it simple and pass the buck.