Well, I would rather think that Kid either was born inside Schala and like with the power of the amulet, Kid sort of just came out of her stomache, litterally. Like with magic, Kid would just magically come out of Schala. Then Schala sent her out through time, This would explain why she is Schala's "Daughter" Clone. It's like asex replication, so Kid would have to be a clone.
Or Kid was acctually formed from Schala's sanity and hope and wills and that part of Schala's brain acctually is Kid.