14 is a very common age for the onset of BPD
Hypersexuality is a trauma response and can develop at any point in life
She was likely groomed into age play or uses it as a coping mechanism
Don't put a vulnerable teenager on blast.
I love cats. I was over at a friends house and it was chilling on the bathroom sink, and for the first time in years I was naked, scars, out, in front of another living being and it let me cuddle afterwards