Hi and thank you for writing us.
For your own BPD, this link may help:
https://bpdfamily.com/message_board/Themes/default/welcome3.htmlThis forum will help with navigating your child's. There is a Sibling/ Parent forum here that can help you.
If you have a specific example on what limit you'd like to set with your daughter, we can help brainstorm with you. Otherwise there is a drop down list at the top of the page on boundaries.
You did a good first step by joining this forum as a part of your network.