Hi Mother-in-law
When was your DIL (daughter-in-law) diagnosed with BPD? Do you feel that she acknowledges and understand her diagnosis?
BPD is quite a challenging disorder indeed and it is very unfortunate that she isn't getting help.
We cannot make other people change if they don't want to, but what we can do is change our own approach and responses. By making those changes, we can change the dynamics of the relationship, regardless of whether the other person changes or not.
I bought Bonn's book and devoured it and gave a copy to my son.
Are you referring in your post to the book by Bon Dobbs '
When Hope is Not Enough'?
When it comes to dealing with BPD, I truly believe knowledge is power. I think it is very good that you are educating yourself about this disorder and are reaching out here for support and advice

Take care and welcome to bpdfamily