Screaming baby, nothing working!


I'm posting for a friend who's daughter is about 3 weeks old. She has been up since 1 am screaming and nothing seems to help. She has fed her, changed her, gave her gas drops, rocked her, put her in her swing, everything under the sun. there's absolutely nothing more this baby needs and she's still screaming I've been here for a while trying to help her. Any tips/tricks to get baby to calm down?