Hi Tanker,
Welcome to the Parenting board, we are glad to have you here with us though sorry to learn that your d29 is suffering and you, along with the rest of your family are suffering too.
Attending a NAMI group or an NEA-BPD Family Connections program is a good idea that
Herodias suggests. In conjunction with an individual therapist, and this online support group can really begin to gain clarity on what is the most supportive, self protective decision to make in situations where fear and confusion usually reign. It isn't ever easy, and it can get better.
Knowing my daughter (dx with ODD, MDD, and Emerging BPD at age 12) I would venture to guess that the reason your daughter is constantly moving is because she is looking outside herself for the cause of her unhappiness/stress/chaos. It is her job, her boss, her environment, her friends, her lack of friends, her housing, etc that are making her unhappy. The constant in all of these is of course "her".
Rather than enable her to continue to look outward by footing the bill for yet another move, have you thought about supporting her by offering to pay for self help (life coach well versed in BPD and ED, individual therapist, Residential Treatment, Intense Outpatient Treatment)?
Dealing with suicidal threats is a scary and painful thing. We are unsure if the threats are for manipulative purposes or the intent is real. I will say it is both. It has been my experience that when my daughter would say "I want to kill myself" or "I'd rather be dead" etc... .that she truly does, in that moment, feel that way. It isn't to manipulate me and I do feel manipulated. Couple these intense in-the-moment feelings with the impulsivity that comes with a BPD/traits of BPD diagnoses and the perfect storm does exist.
Developing an understanding of how to best handle these suicidal threats can be a great relief. Here is some information to help you get a broader perspective and aid you in developing a plan of action regarding suicidal threats:
WorkShop: Dealing with Threats of Suicide and Suicide Attempts Crisis Safety Plan Particularly Part II that talks about knowing the consequences and potential outcomes of any action that you take.
Please stay with us and continue to let us know how we can help. We are here to support you as you learn how to take care of your needs and support your daughter.
lbj