A BPD will certainly hurl abuse towards you. And they will use words like "YOU are... .", "YOU did... .". But underneath, they aren't actually angry with you at all, they are angry with themselves.
Having a boundary, and shutting her down, is a method to control this. But I don't believe it's a very good method.
BPDs are hurting inside, and OVERFLOWING with emotion. Shutting her down helps YOU, but it does nothing to allow her to release her pain.
Saying NOTHING when she rages also doesn't help, because she doesn't believe you actually hear her.
A different technique is to listen and Validate her. It's difficult, because you need to ignore words directed at YOU, ignore the blame, and instead just hear the emotion and pain she is saying. You need to ignore her very twisted logic or wrong "facts", and hear the emotion and pain she is saying. When you listen, and she feels heard, she is able to release those emotions, and she can then start to feel better. "Validation" is a technique that works! Read about it here:
https://bpdfamily.com/message_board/index.php?board=36.0