Hello Mombum and welcome to BPD family
I'm sorry for what you're going through with your daughter and glad you have found a community where many parents of adolescents have been through similar experiences and RTC. You are not alone.
I understand how very upsetting it must be for you to hear your daughter say she feels dead inside, suicide ideation, feeling unloved. It can also be considered a cry for help despite her defiance. You have the opportunity while she is still in your care to seek a diagnosis and treatment and take the decisions for her best interest. What point are you at with talking to her mental health carers that you believe your daughter maybe suffering from more than just depression, BPD? You say you have been looking at RTCs and have an appointment in 9 days.
Here is a highly recommended book for parents of adolescents
Borderline Personality Disorder in Adolescents The review says "Many therapists are hesitant to diagnose a teen with Borderline Personality Disorder because of the belief that the personality is not fully developed until after age 18. One problem is that after 18, a child can refuse treatment or limit the parents access to their care. Another problem is that treatment If the Borderline Personality Disorder could be reliably diagnosed earlier, parents can do more for their children. This expert from Harvard's McLean Hospital believes that it can be."
To the right of your screen are helpful tools and lessons including communicating boundaries and limits that you spoke of.
It's encouraging your daughter has agreed to take her meds, |iiiiI hope you see results soon.
There are wonderful educational resources available here and you can be assured of truly great advice and support from members, glad you found us, keep posting and let us know how you are coping.
WDx