GgJ - I know that you're focusing a lot of your time and energy on your ex-fiance because you're searching for answers...This situation is crazy making as it is/was for all of us on this forum for our own situations.
If you don't mind, I'd like to distract you away from her for one moment and ask what are you doing to take care of yourself? As in you, not you in relation to her/her situation/her family?
As addicts are addicted to a substance, we need to be careful NOT to be addicted to the addicts in our lives.