I'm looking for a book title may have been something along the lines of 'let it flow'?
That one's a bir hard to pin down, and brings to mind a couple of titles, but I'm not sure if either of them have the lines "Let it flow" that were used in the speech.
The first one comes to mind when anyone mentions high school students and journalling, and that is The Freedom Writers Diary, by Erin Gruwell and her students, the Freedom Writers, which chronicles the true life experience of a teacher giving her students the challenge of writing open and honest journals. It has since been turned into a movie, but I don't think it deals with suicide.
A second possibility is a fiction work, called After the death of Anna Gonzales, by Terri Fields. It's a novel told in poems, that was written in the voices of forty-seven people, including students, teachers, and other school staff. It records the aftermath of a high school student's suicide and the preoccupations of teen life. However, we don't own a copy in the Omaha Library System. If that sounds familiar, we could probably get it via interlibrary loan for you.
These are only two possibilities that were the best match with students and teacher journal writing. We can keep looking! Especially if you can remember anything else that would separate it from the crowd.
Thanks for your question!