I’m a long-term best friend/ FP of an (unofficially diagnosed) pwBPD. Recent events have made her mental health decline to crazy lows. 

She’s almost at a record low weight due to undereating and only consuming snack foods (43 kg at 163 cm). Completely fallen off the wagon with substance abuse and is using hard drugs almost every day. Doesn’t sleep nearly enough and when she tries to, binge watches Instagram reels and movie recaps to try numb the thoughts before bed.

She’s just moved to my country and barely knows anyone here. I want to stage an intervention but have no idea how to do so without invalidating her and her agency. I’m extremely worried to the point that whenever I have to leave her alone all I can do is obsess about what she might be feeling / doing to herself.

Any advice for an FP just trying to do their best for their loved one but feeling like they’re on a death spiral?