Hey,
I am really sorry to hear about your friend. But at least you now know and will able to help and support her. I'm sure you already have done, but have a sit down and have a real heart to heart with her, maybe if you can find out why she has been feeling down that will be a start, and it may even solve things. If not, she does need to talk to her personal tutor, when you are having problems they really are helpful.
Good luck, keep us informed
Sarah-Jane x