User blog comment:Shadow&Maria/Can Anyone Tell Me..../@comment-1272757-20120916050527

Shadow met Amy during Shadow, Rouge, and Eggman's raid of the same island base at which Sonic was being held. Shadow, Rouge, and Eggman were there to steal a Chaos Emerald. Amy, Tails, and Knuckles happened to be there to break Sonic out of jail. While there, Amy saw Shadow and mistook him for Sonic.