Nursebee - I don't know if she is BPD, but there is certainly something wrong with her. According to reports, she is a cumplusive liar, a thief, and a child loser. When you put compulsive lying together with stealing, I tend to think more narccistic, borderline personality disorder - but I KNOW nothing. She could also be sciziphrenic (sp?). Schiphenia (sp?) is known to manifest in the late teens, early twenties sometimes. I think it all depends on how long she has been a compulsive liar.
What I find unforgiveable about her parents, is that they knew she had these problems and they did not seek mental/emotional/physical medical help for her. It does not help when a parent enables their child to be crazy. Rather than make excuses for them and allow them to run around ruining their lives and the lives of others, a parent should take the bull by the horns and get the child help. Once the child has received help, they will probably have a better life! I get very frustrated with this. Casey was probably displaying signs of mental issues in high school and around the time she got pregnant. The parents should have acted.
Having said all that, I need to say "there, but for the grace of God, go I." I hope that if this ever happens in my family, I will be able to recognize it and take action to get the necessary help, before it is too late.
Salem