A somewhat similar scenario, is in the documentary No Stone Unturned, about the UK’s use of double agents as part of their war on Ireland during the troubles.
Basically a couple of terrorists murdered some innocent catholic civilians in a pub in a small town in northern Ireland. Turns they were loyalist terrorists that were active in the british army, and were being employed by the brits as informants. Its doubtful that MI6 ordered the attack, but as part of sweeping their counter-intelligence fuckery under the rug, they deemed these terrorists as untouchable, and protect them to this day. It took the victim’s families refusing to accept the brit’s explanations, and a lot of good journalists to discover who these terrorists were.
The US is go-fund-me-ing their assassination attempts nowadays, I think she’s safe.