The child in the photo is NOT killed, based on the account activities (recent photo uploads) she is alive and doing well. The photo is from a Russian Instagram account, account name “Tamuna 🇬🇪🇷🇺”, which uploaded on December 24 2018 in Moscow.
More in the EXPLANATION and REFERENCE section.
CATEGORY: False Context.
SOURCE: Twitter, https://archive.vn/iXv7e (backup archive).
NARRATIVE: “Her name is Malak Al-Tanani, she was killed by Israeli war planes.
They said she posed a threat to the State of Israel!
Based on 7 Types of Mis- and Disinformation by First Draft, classified as “False Context: When genuine content is shared with false contextual information” .
The SOURCE shared a picture of a child who is alive and doing well with FALSE narrative, which has caused MISLEADING conclusion.
Identical photo, tamuna_sh: “#love”. 
Other account activities (recent photo uploads), which indicates that the child is alive and well 
HoaxEye: “The child in that photo was not a victim of an air strike in Gaza. The photograph was taken in Moscow, 2018. Source: https://www.instagram.com/p/BrxNac6H4dX/ Based on the recent photos on Instagram, the child is doing well. Please stop posting this photograph.” 
 @tamuna_sh on instagram.com, https://bit.ly/3wcRLEl / printed as PDF (backup archive).