[Simplemen]

She was not dead at that time but suffered head injury as per her mother. Now they only found a bone of her head, likely killed by airstrikes

Her mother said she was informed that a fragment of her skull bone was found (& they did DNA test)

But the media twisted it to say she was "decapitated"

Your theory that she was likely killed by airstrikes & blown to pieces could explain the hesitation on the part of the Israelis to say how she died & where her body was found.