I'm very new here so I apologise if my writing is located incorrectly, but I was scanning through this wiki and had a sudden memory. In Harry Potter and the Deathly Hallows: Part 2, in the mourning period before Harry goes to meet Voldemort, there is a breif moment where Professor Trelawney and Pavarti Patil can be seen sobbing whilst pulling a white sheet over someone. Although the films are not gospel truth, I have reasoning to believe that the body was Lavender, which would mean she would be proclaimed dead, would it not? Just a little food for thought, as they say.