I can't speak to Sophie specifically, but I have known a couple of people who were dishonest with their therapists specifically for fear of mandatory reporting rules.

I think both were wrong about meeting the bar for an involuntary in-patient evaluation, but this is nowhere near my expertise. To my understanding, passive suicidal thoughts don't trigger it, only active planning.

I don't really have a point here, just sharing anecdata. I have no idea or opinion on what the real tradeoffs here are.