Hi again OnTheSearch
I have to rely on her boyfriend who is the only one permitted to know anything and he is not particularly aggressive (which may be a good thing).
How would you describe the relationship between your daughter and her boyfriend? How do they generally treat each other?
Does anyone have an opinion as to whether I should visit or not?
I think it does not even really matter what 'should' or 'shouldn't' be done. It think what's most important to consider is if you want to visit her or not and whether visiting her now will be in her long term best interest. When you ask yourself these questions, what are your answers?
I'm trying to walk the line between giving her pretty total control of MY life (which has been the case for the last ten years) and letting her know I am not abandoning her.
Validation and boundaries go hand in hand in my opinion. Loving boundaries is probably the best approach because love without boundaries really isn't love at all and can lead to total self-sacrifice for another which definitely would not be in your best interest. Also setting boundaries without empathy or love can easily make you lose sight of why you were setting boundaries in the first place.
Your daughter needs to learn from the consequences of her behavior and at the same time you can still show her that you care for her, without actually taking care of her. Being caring is something you can take responsibility for, but your daughter is the one responsible for taking care of herself.
Your daughter's situation is quite serious with her self-harm and suicidal tendencies. Though being firm with your boundaries is crucial, unconditional love is also crucial as it signals to her that though there might be consequences if she misbehaves, she is still unconditionally loved and accepted as a person. Loving boundaries.