The Mobius I never knew (my sonic the hedgehog book crossover)

what happens when I, Sophie, somehow meet someone who knows my friends, but we never met her before in our lives? how does this girl know us or am I crazy? what will happen when I met a girl who is similar to me, especially on where we both came from? is she a spy? a criminal? a stalker? an egg man creation? I DON'T KNOW! is she a hero like one of us; or is she a traitor and leading us into a trap?