Hello datcat, welcome I'm in London too (north), my 27 year old daughter was diagnosed BPD last July, recently commenced DBT and lives with me. I'm sorry your ex wife is unable to support you at this time. May I ask what traits/symptoms your daughter displays, you mention anorexia, has this come to the attention of her GP at any point? I'm sorry your daughter has been disrespectful to you and hope the tools and lessons you learn here help you communicate.
My daughter was very able to hide many of her symptoms through her teen and early 20s, or perhaps I should have paid more attention? Successful at school, uni, work and with friendships. At 18 she was very thin and I believe she was fed up with bulimia ruling her, she agreed to go to the GP who forwarded her for treatment which she attended for 8 months and then missed an appointment - the treatment was withdrawn, not that it ever worked as the treatment was only focusing on one symptom bulimia. Over the next 9 years the disorder gradually manifested, cutting, anxiety, depression, psychosis, risky behaviour, alcohol dependence ... .finally overdose and self harm hospitalisations and suicidal thoughts last year. Sounds awful, however she is in a better place now having taken on responsibility to recover.
In 9 years the medical profession has moved on, I believe if my daughter presented herself today at as an 18 yr old to our GP with an eating disorder they would gently build her trust and explore wider symptoms for a diagnosis. It's hard for our kids to accept and understand they need help, in my daughter's case she was focused and motivated to keep up with her peers which is very natural for all young people, regardless of disorder my daughter strives to be independent in her own way, like many.
Have you considered visiting your GP for advice at this point?
I'm a single parent, with one child, my daughter's father is unable to engage with me, like your ex - it feeds his own anxiety, it's all about him, always has been, my daughter now understands why, and accepts him for who he is. That said one of my sisters, my friends who are family and many of my daughters wonderful friends do understand her challenge, we are learning and walking together with my daughter who appreciates our support.
Glad your wife and your daughters siblings are walking and learning with you and your daughter.

WDx