I asked her why she would do this she said "the past is the past" and "her message was nice"... .she is aware of the betrayal and maltreatment/emotional abuse this BPD put me and my husband through... .
She doesn't share your hurt - it's understandable.
It's all very superficial stuff that will likely go away... .you can change your settings so that she can't peak into your Facebook posts... .
Is it really a threat? Or is it just annoyance?