Hey there,
Heard about your history of the problems your sister has been facing for years.
I must tell you that psychiatrist have to take a detailed psychiatric history and MSE to come to a diagnosis and manage accordingly.
Was she under the care of a mental health professional?
Who diagnosed her as a case of Borderline personality disorders?
She may be suffering from obsessive compulsive spectrum disorder with another psychiatric disorder.
Next Steps
She is trying to treat herself by psychological interventions but without any fruitful results.
She definitely needs the care from a psychiatrist.
Health Tips
Help from your family members and friends is to be needed to convince her to go for the psychiatric care from a mental health professional.
Medications and psychological interventions from the trained professionals is what she needs now.