Since the manga doesn’t have any negative tags (yet), one of my theories is that Aizawa is in a coma/indefinite state of sleep due to some supernatural incidents that is probably the future plot and the school is a theory many others made and I agree to as well, which is place she couldn’t come to but wanted to so bad that she became attached.
Like that Reese Witherspoon movie.
Not with this thing around. And even outside extras, pretty sure the school would not have her photo and flowers on her desk if she wasn't actually dead, nor would it be announced in the news.
Her guardians could be hiding that she's in a coma. So when she wakes up, she can be a normal student.
Personally, the ending depends on the success of the manga. If it sucked, platonic human and ghost. If it did great, yurification and handholding.