Hello piggy123 and welcome! I am so glad that you have found us and want to thank you for sharing some of your story. I understand that feeling of being "scared to death", as I am sure most other parents on here do to. Of course all parents worry, but BPD comes with its own special set of worries that no parent should have to deal with. Most other parents with "normal" children don't "get" our unique worries, but I want you to know, EVERYONE here gets it, piggy123.
If she put the effort in, she could do well in college, but her separation anxiety (that she doesn't realize she has) will hinder her as the university near us is "too close" for her.
Oh, how I can relate to this, p123. My own BPD dd21, also didn't realize (or was more likely in denial of) her own separation anxiety at age 17 as well. We had the same dilemma - not wanting her to go far away to school - as we were genuinely scared that she could end up dead... .either by her own hand, or by getting herself involved in dangerous situations, as she was prone to do. Since she was still only 17 when she graduated high school, we still had some control over her legally, not to mention we had control over most of her money (even her own savings for post secondary). So while she could have, on her own, done all the legwork to figure out the logistics of applying to other schools, we made it clear we wanted her to go the our local college. She got into a competitive nursing program (which she almost blew by hiding that she was failing one high school credit - yet another story... .) and was very proud to have done so. We talked about her going here for the first year, seeing how it went and then transferring for the remainder or taking another program she was interested elsewhere after she successfully finished the nursing here. We were hoping beyond hope that it was the drama of high school causing much of her problems, but within a month in college it became very clear that the problems were within her. Keeping her close was the best parenting decision we ever made... .she very well
could be dead right now if she was engaging in her risky behaviours in a large city three hours or more away instead of in our small rural city where we could keep and eye on things and be involved. Even so, it was a hell of a ride... .one that I wouldn't wish on anyone. She does occasionally bring up how we "forced" her to stay here and that she resents it, but we do not regret it one bit. And for the record, we did not force her, we just did not support, encourage or help her with the logistics of going elsewhere. So, p123, if you are truly scared for her safety and have any sway whatsoever over her decision where to go, my advice is to trust your instincts... .
You are be commended for all that you have done for your daughter, piggy123. It is very obvious that you are a loving mother and your daughter has grown up in a supportive environment. How did your daughter react to the therapist mentioning BPD? Is she willing to sign the DBT contract? The fact that you have a good working relationship with your daughter's therapist is awesome, as is the fact that she seems to have a good therapist!
Please keep posting, p123, when you feel up to it. Also, if you haven't already found them, the lessons on the right hand side of this page

are a great place to learn ways to best interact with your child.
Again, welcome, p123. You are not alone. MomMae