Seventeen-year-old Annika "Anni" Meier died Tuesday afternoon at her home after a long battle with brain cancer complications, surrounded by her parents and two brothers. WATCH STORY HEREOn Wednesday, hundreds of Rockford High School students gathered to commemorate their classmate, wearing pink Anni's favorite color. "She's been a force for all of us. I think we're all better people. Seeing her always be such a light through the hallways," said…