You stated that she has always had a low SD is that correct? If that's the case then do you think she would be willing to see her Dr? There could be something medically wrong with her that can be corrected.
Then again she may simply be one of those women who just truly does have a very low SD.
I think we may need some more background on her however before anyone can truly give you some help here. What's her background like? Family? Past romantic R's? Any history of abuse/trauma?
If you can answer these things it will really help.
