The Mossad is certainly capable of killing people in more low profile ways. There's no reason to believe this was ordered at a high level. Most likely, it was an individual soldier's fault.
And the fact that she had press gear on is really not the kind of guarantee one might hope.
Here's a video of a "medic" grabbing a downed Hamas fighter's AK47 to give it to another fighter so they can use it to try to kill IDF soldiers:
https://old.reddit.com/r/CombatFootage/comments/17rff07/west...