There's almost no way this can be anything but death. If Nozomi were expelled or moved away, Eli still has her number. I suppose you could argue she's in a coma/vegetative state, but it makes less sense for her to be talking to thin air, rather than at her side in the hospital. As for her comment on teachers, she was likely forced to give a speech she was in no condition to give(going by her being before a microphone in her uniform).