That our media has a double standard, a bias for supporting Israel. Russia killed children in Ukraine, they say “killed”. Israel killed children in Palestine, but they won’t say that - instead, those children are just “dead”.
Very little difference in practice because the killing by IDF is implied or deducted anyway - but it’s a difference in rhetoric.
That six year old child was not “dead”, she was killed by Israel. Her relatives, whose corpses she spent her last days surrounded by, were killed by Israel.
It's a common propaganda tactic to use slightly different terms for the same thing, depending on how the victims are viewed by a country and its media. Some people die, as if they were doomed anyway, or as if they were just statistics in a paper. Some others are killed, like actively by the hand of the enemy, which makes it tragic and sad.
It's one of the differences between unworthy and worthy (of media coverage, or consideration by the public) victims.