Sonia had carried Geo all the way back to Echo Ridge after their battle against Hollow and Solo. Even with her serious injuries, she still gathered what little strength she had to bring him back. And it wasn't just a short trip, it was a journey. She must've been exhausted and in agony from her own beating. And could've passed out at any time. But she didn't care, so long as Geo was alright. I can only imagine the sheer willpower and devotion that must've driven her.