The death of my sun

Adelaide is a teenagegirl like any other until she one day findes her sister in the bathroom, having overdosed. The only thing is, Adelaide knows her sister, and she wouldn't have done that, if she was sad or even depressed she would have told her. Unable to accept what have happened Adelaide decides to look into her sister's death as everyone else just thinks of it as a normal suicde.

Declaimer: I am dylexic and and can't spell if my life depended on it
Am thinking about doing a romance subplot but am stil not sure.