Friday, Yasmin Acree's relatives delivered a letter to police headquarters requesting a meeting with Superintendent Jody Weis.
The teen vanished from her home in January of 2008.
No one has been arrested in the case.
Acree's family accused the police department of treating this as a runaway case.
"Had they just not fumbled the ball at the beginning, we could be well on our way -- we could even have had Yasmin back at home, and this honor roll student would be in school," said Ira Acree, Yasmin Acree's cousin.
The Chicago Police Department says it continues to aggressively investigate the case and investigators will meet with her family.