How very stupid is she?! You flaunt your life on Instagram and you don’t know who is watching, especially as they have their house on the market, so you never know people might just be trying there luck. I always always double check I’ve locked the car, it’s just something I do religiously without thinking. To admit you didn’t lock the car of social media is so silly. I doubt the insurance will pay out as not ok her persons and you kind of invite thieves to steal your stuff if you are mad enough to leave your car unlocked, especially in London! No doubt she’ll get gifted replacement rings!