Why wasn't Catherine on the ARK already?

[A.M Team]

That could be but I'd say it's more likely she was duped. Obviously we don't know how the Ark was programmed, but since it's made to support multiple people, and every time a person does a scan that scan is unique, most likely the Ark will treat two different copies of the same person as two different people.

If there were two Catherines then how could the Catherine that Simon-3 meets knows him and literally embraces him with open arms?