Who "killed" Adeline?

It’s Chinese New Year! Quite busy during this few days, spring cleaning, going to my relatives and friends’ houses, playing and most importantly, getting red packets! Haha. Going to be rich by the end of the month!
Coming to the main topic, who “killed” Adeline? Those who do not know, it is based on Little Ironies by Catherine Lim. So, what caused Adeline to commit suicide? I think that there are many reasons which lead to Adeline’s death. One of them could be the fact that Adeline’s teacher did not give the 1 mark for Adeline’s English Language examinations which is needed for her to pass the examinations. Another could be that her parents were demanding her to study and often compare Adeline with their friends’ children and caused Adeline to be stressful.
However, I think that the one who really killed Adeline is herself. It is actually her attitude towards studying. She could have be more optimistic and look through her paper to see where the mistake lies and improve, rather than to commit suicide.
According to her teacher, she was good and stable in secondary 1 and 2. However, the year before the incident happened, she suddenly changed. That year, Adeline did not seem able to concentrate and interested in her work. That could be the reason why she failed the examinations. So, why did she suddenly change?
I think that it is the fact that she is not emotionally stable. In her diary, she wrote that her parents were demanding her to study and that she really wanted to study. One could read from her diary that she was almost crazy when she wrote that diary entry. As I had mention earlier, she was probably stressed out by her parents. However, her parents’ advice to study hard should act as a motivation to Adeline. In conclusion, I think that no one is to blame for Adeline’s death but herself.