She is a 19 year old from Alderney, and possesses a rather dark and cynical attitude, judging from her profile. It is hinted that she is "goth", due to her stereotypical behavior (dark attitude, self-mutilation, etc.) Adding to this is her name, which is a homophone of "suicide".
Events of GTA IV
No matter how many times Niko Bellic contacts her, she will never date him.