My mother has a horrible sexual child abuse history made worse as after her mom died young when my mom was 12 and her older siblings moved out, she was left alone with their father. It stopped at 14 when he croaked and she was orphaned. He already had moved prostitutes in from time to time as well.
I knew that she'd been doing intense therapy since 1989 when I graduated high school and moved out. About 6 years ago, she shared with me that one of her therapists gave her a book on BPD to suggest that her father had it, yet my mom took it to also mean that she was being given a roundabout Dx of BPD herself. My mom accepted that she was a pwBPD.
What blew my away more was that she also admitted that when I was little (late 70s, early 80s?) That she was in therapy for PTSD due to her childhood.
This might shed some light for you (click on the quote link for the whole discussion)
Clinicians often use PTSD (which has a reimbursement code) to describe C-PTSD, a disorder first proposed by Judith Herman, MD, a professor of clinical psychology at Harvard University, but one that has yet to be recognized as an official diagnosis. Patients with C-PTSD are often classified as PTSD, as I mentioned above or ":)isorder of Extreme Stress, not otherwise specified”, or “personality change due to classifications found elsewhere”. Further complications in diagnosis arise when one considers the high levels of co-morbidity which are seen in patients who have complicated trauma histories. Diagnosis which often accompany C-PTSD are depression, OCD, Borderline Personality Disorder, Dissociative Disorders such as DID, agoraphobia and social phobia.
In the context of BPD, some believe that BPD could be divided between suffers that experienced trauma - C-PTSD - and those that did not - BPD. An alternative is to see C-PTSD as a comorbidity with BPD when trauma is a factor.