With children, they have developmental periods, and in the teenage years they are developing emotional maturity in the frontal lobe. So could this be linked to that ? Does she seam more mature ? Where there other big changes/influences in her life from last year to this ?
PTSD is well know to have cycles (and is often co morbid with BPD). They tend to be the same length, but never longer than 10 years. But I have never read that BPD cycles, possibly someone else has seen research on this. But I hope this helps.
