I looked Amy's hight on the fandom Sonic wiki and it says she's 2

Sonic the Hedgehog - SRB2 Wiki

Sonic Origins - Wikipedia

Amy Rose, Sonic the Hedgehog 3D Renders Wiki

Blueberry Violet, Amy Rose, Hedgehog, sonic The Hedgehog, wikia

Mecha Amy Rose, Wiki

Amy for funvideotv wiki by snivy0711 on DeviantArt

that's on the official Sonic wiki, wich means it's a fact. : r

Amy Rose, Wiki

Sega Sammy Holdings, sonic Extreme, Sonic Crackers, sonic Colors, Sonic the Hedgehog 3, sonic Team, shadow The Hedgehog, Hedgehog, sonic The Hedgehog, wiki

Sonic Allstars Racing Transformed, sonic Sega Allstars Racing, metal Sonic, silver The Hedgehog, shadow The Hedgehog, sega, Hedgehog, sonic The Hedgehog, wikia, wiki