And you're in no position to decide what's reasonable or not in this case. You don't know what was said to her at work, by her colleagues, by her neighbours/family etc after this event. She might have heard herself being humiliated worldwide. It's hardly the same as some anonymous person calling another anonymous person on the internet names. Suicide is a complex tragedy and anything can tip a rational person over the edge.
This makes no sense. What they did was stupid, yes. And they acted like jerks, yes. And they boasted etc etc yes. But she acted in a completely different way to what a "reasonable" person would act.