Very true. I do worry about recurrence for her, though, since she had secondary lung cancer after her initial bout with the bone cancer in her leg. I can't imagine not taking my child for at least semi-annual checkups with an oncologist or appropriate specialist (even if I were broke and had to beg for her to be seen). Of course, it's possible she was taken for appropriate medical care.
However, if EB were abusing Zahra as badly as those around them would have us believe, EB may have not wanted her to be enrolled in school or to see any doctor whatsoever for fear she might tell on her. In that case, I could see an infection or a cancer recurrence (or any other illness) being neglected out of selfishness.
I think until we know something, these kinds of thoughts are gonna be floating around. It's really hard to say what would be the worst case scenario out of all we've wondered about here. If she is gone, I almost hope she was overdosed and fell asleep peacefully. What a horrid thing to even think...but compared to some other scenarios, definitely the lesser of evils.