Hi Roxy Pearl,
The situation with your daughter sounds complicated and I can see how this could really take a toll on you. BPD really is quite a challenging disorder. I understand your desire to help your daughter. Unfortunately we can't make people change if they don't want to. Do you feel like your daughter has ever in any way acknowledged that there might be something wrong with her behavior and/or indicated that she might be willing to get into therapy?
You can't make your daughter change if she doesn't want to but what you can do is change your own behavior. By changing your own behavior you will change the dynamics of the relationship you have with your daughter. To help you achieve this I suggest you take a look at some of the communication techniques described on this website:
A 3 Minute Lesson on Ending ConflictS.E.T. - Support, Empathy and TruthS.E.T. is a technique for communication with a person with BPD. The technique helps you to express your truth while minimizing the chance of (further) conflict and maximizing the chance of getting through to the other person.
Since you mention how she 'tortures' you by texting and how she screams at you, I also suggest you take a loot at some information we have on here about boundaries:
Getting Our Values and Boundaries in OrderExamples of boundariesDo you feel like setting and enforcing (stricter) boundaries with your daughter is something you would be comfortable with doing?