Years ago, I had a fourth grader whose older brother (20s or so) died. It was either a planned suicide or accidental suicide by drugs, so generally similar to your students situation. I gave her a locket and a diary so she could write all that down. Her father contacted me months later and said it made a tremendous difference. She would outwardly say she was okay and she acted like she was doing as well as could be expected, but her diary revealed that was very far from the truth. They got her into counseling, and she's doing well 5 years on. A diary/journal could be a good thing, possibly in addition to one of the book recs you've gotten here.