The Moment Keeper by Buffy Andrews
Another Carina author! This is an unusual story of two girls, a generation apart. One is poor, brought up by her grandmother, bullied at school, with few friends. The other is rich, spoilt by her doting parents, popular at school. On the surface they have little in common, but the first girl, Sarah, who has killed herself, is the 'moment keeper' for the second, Olivia. It's Sarah's job to record the most important moments in Olivia's life. As she watches her grow and develop, Sarah finds they have more in common that was at first apparent.
A warm-hearted tale of love, which keeps you turning the pages. Possibly to my middle-aged English mind the values and preoccupations of the teenage American girls were a little hard to comprehend but it's an enjoyable tale nevertheless.