Cannabis helped me a lot through my teenage years. In fact, I'm not so sure I would've been alive if it weren't for cannabis. It was the only thing that actually did something for me, unlike the antidepressants thrown at me by professionals. I've avoided acting upon many suicidal urges by smoking cannabis first. However, it has also become a problem for me, and I do think there are healthier ways of coping with my emotions. Those ways are just not as simple, effective and obvious. I agree that you should talk with her about seeing a psychiatrist.