Hi SeekingHelp2.
as you tell you are already working on boundaries: Keep working on it. The clearer they are and the less control is between the two of you the better. What else can you do? Validate her - she is upset, feel unfairly treated, angry, can't stand you, wants to be left alone etc... There will be a lot of mostly negative emotions to validate. Kids can also be grateful for some validation and you'll may find it a balancing thing to do. For all practical purposes there can't be enough validation in a family and practice of it.
Working on a healthy self and surrounding is important - as you have noticed there is no quick fix but some slow improvements so looking after yourself is critical.
General books on BPD more suitable for Staying are:
Loving Someone with Borderline Personality Disorder - S. Manning
The Essential Family Guide to Borderline Personality Disorder - R. Kreger
Book on validation:
The High Conflict Couple - A. Fruzzetti (there is a 1h video here with a number of the key concepts:
https://bpdfamily.com/message_board/index.php?topic=206132.0 which is a
must see for Staying Members)
You find more books in the book review section of the board here:
https://bpdfamily.com/message_board/index.php?board=33.0