What really happened to Haley?

Ok this first look is absoultely incredible! I want to know if Haley is really dead, first rule is if there is no body are they really dead!?! The grief that Ella has is so real and breaks my heart to read her struggling to cope with the guilt of killing her best friend. I'm interested in seeing how the old friend group with react to Ella as the school year goes on and what secrets Ella might find in Haley's room.