Why they don't have school shootings in Israel
That picture is showing up all over the web, but so far, I have yet to see a single instance of where the particular school is name or that the woman with the rifle is a teacher. I have found, however, claims that it is a school fieldtrip away from school and that the accompanying woman is a parent or possibly a security guard.
I only know 2 folks who have lived in Israel in recent years and neither has seen teachers with firearms. Scanning the internet for images of Israeli teachers and there is a startling lack of images showing teachers with guns and those that purportedly show teachers with guns are like the image above that make the claim without any sort of identifying information/context and certainly nothing that can be verified.
Granted, there aren't many school schootings in Israel, but there are bombings, mortar, rocket, cannon, and missile attacks along with the occasional incursions from their neighbors in hopes of reclaiming territory.