Yes, co-morbidity is often mentioned here and is present more than many people think. However, if it isn't diagnosed - and it often isn't - then we just have to reach our own informed conclusions.
Thank you for responding and your insight. She is not diagnosed as BPD, and that has been part of my struggle through the years. So much of her behavior has been normalized in my family system. It's as much the normalization in my family as what I suspect is her uBPD that had a huge impact on me - particularly as the one that was the scapegoat and the target/object of most of her "splitting" behavior early on (until I removed myself from the system). One of the things that triggered her through the years were the things just like this - she would make claims that simply were not true - but she would say it with such certainty and she would claim level of authority that no one questioned her ... except me. I've since recognized that this is likely *one* of the reasons why she targeted me so much, but at the time I thought nothing of it. The frustrating part was that no one in my FOO would acknowledge how off base she was...and she was clearly saying things that were untrue. Then it turned into her making claims that were more and more fantastical and unlikely, and she would assert facts about her and others' health that, if unchallenged, were dangerous. That's the first time all of this amped up to a whole new level - one that severely damaged our relationship, harmed my relationship with other family members, ultimately led to me distancing and going no contact with her for quite a while.