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Hi, this is Dr Ansari, welcome to JA.
This is a very touchy thing to discuss as you may get an angry response, however, you have to approach her with some examples of persons behaving like her, say in a drama or movie. Don't tell her directly what is in your mind but let her observe.
You can try this link as well: https://www.nhs.uk/mental-health/
That's great that you thought of her wellbeing and health. BPD require a complete set of therapy under a psychiatrist, She is taking any medications?
She needs Treatment and cares both so you have to take her to a Psychiatrist and contact social support and guidance: Social care and support guide - NHS (www.nhs.uk)
No sir you are doing a great job, you are a real gentleman. Keep helping her without her getting aware of it.