Teddy vouched for the fact the woman is Megan, and Amelia discovered that she was being transferred to the U.S. Megan is on her way home, and Owen (and Nathan, who is currently mooning over another woman) will get to meet her again for the first time… unless something goes terribly wrong in the finale, which could happen.
He couldn’t even believe it was her at first, but Amelia managed to get in touch with an army hospital that was treating her.
This is Grey’s Anatomy we’re talking about.
Owen’s immediately went into a spiral of guilt and PTSD as he realized that while he gave up on his sister and moved on with his life, she was alive and possibly being tortured.