How is your friend taking the news? I can't imagine the level of sadness at the thought of your own biological birth mother giving you up like that. Freud says they go through their whole life trying to avoid abandonment.
I'd imagine the sadness easily turning into some sort of aimless wrath. It's like being told you've lived a lie to save birthgiver's face. Maybe that's what happened to Paul Le Roux when he found out he was not only adopted but that they didn't even bother giving it a name.