Answer:
Kenya makes Star feel guilty by telling her that she would speak up for her friends at Williamson, but not for her best friend (Khalil) that was murdered. When the news came on after his death... next to his name was, "suspected drug dealer."
Step-by-step explanation:
I saw the movie and read the book :)
Star basically lives two lives within Garden Heights and Williamson.
She doesn't want anyone at Williamson to know that she was with Khalil when he got shot.
It takes her a long time to finally get the courage to speak up for Khalil and take action.