Had to write an opposition piece to Suziebbz as I have been keeping an eye out for this question for a while.
I am 16 years old, and I live in birmingham.
As she said I may have 'emotional' characteristics, but this doesn't make any situation any less horrid.
Although to do with your question, like she said she is probably attention seeking. And I imagine, most people who say they are going to commit suicide, do not. It is just her way of getting attention- obviously because it works, and this is very stressful to you, especially at this time.
Sit her down and try and talk to her about what is 'really' wrong. I'm guessing it is probably bullying at school or something similar. And go from there. Also, get down to the GP and try and get some councilling for her. Or talk to the school as they have a counsellor. This worked really well for me.
And to suziebbz, I was truly depressed for about a year for various reasons, and I tried to commit suicide once and refused to go to, however after counselling for about 6 months, I have turned my life around.
I was not being dramatic, I was not attention seeking. I truly needed help.
And it sounds like debbie3103's daughter does too. Ignored it could get worse.