I think my best friend is using cocaine, How would I know or find out so I can call her out and get her help?

She has lost a lot of weight. She is always broke. She has very bad mood swings. She never sleeps. She was just diagnosed with hypertension at a very young age. She has been dating a guy I suspect uses drugs. She is always on the go never stopping. She is very paranoid. These symptoms started about 3 months ago. I would appreciate any help.