Well you're still wrong. Since she was in Melee, there is no reason whatsoever to assume she is out. You should assume everyone from Melee is in, then try and see what points to them being out. The clones have that working against them. Shiek, the only the working against her is the continuity thing, and neither side has any reason to believe they are right, we don't know if Sakurai cares about continuity or not.
Therefore, there is no logical reason to assume anything other than Shiek is returning.