Wow, I am so relieved to read these responses!

As you could probably tell, I was panicking about the fall-out that would come from my reply to her, but figured that some closure or something was necessary. I have found a lot of success so far with the 'do not respond' strategy, so I can definitely continue to do that.
Identifying this "apology" as bait (which I am certain it is) and Zachira's point that
your sister's BPD does not allow her to have empathy for you, and if you try to explain, she will use it to make things worse for you
are extremely helpful and have brought me back from panic to the place of calm and centeredness that I have worked so hard to get to.
Thank you a ton!
