My best friend H who is a teenager (I am also a teenager) has struggled with her mental health before sent me messages saying ‘r u there, i’m not ok, please respond, please i cant’ after deleting two messages she sent me. I currently live in another country in a diffrent time zone. I’ve send a whole load of messages saying whats wrong are you okay and things and she hasnt replied or seen them. I’m terrified and I feel so defencless and i dont know what to do. Please, what do I do?