Okay, now I want CG to add Sister to the clones

I believe you have a very warped view on what SW canon is sim. Although a quick google search might tell that a character from some book or comic is canon, that is more often than not, incorrect. Many of these characters from the old expanded universe, (mostly referred to now as “legends”) were considered canon during the late 2000’s and early 2010’s. However, beginning around the same time as TCW animated tv show, many of these characters that were created by sanctioned authors, were fazed out as more official media with less contradictions took their place. Unfortunately for you, this includes characters sister. sister was once considered fringe canon, but is no longer. sister is merely a legends character with no official backing, who only exists in headcanons.