Honestly, I've always disliked transformations for specials simply because I think that's too complicated to have Kirby copy. He already has to load in hats and props. Transforming too would be a lot. The only way I could see it happen would be Melee/Brawl Zelda/Sheik / Pkmn Trainor style with the transforming the down special and the neutral, side, and up specials be moves per form. Then Kirby can copy just the simple specials. But otherwise I picture her transformations to be instant interwoven with her moves the same way, but on normal smash attacks etc and free up her specials for something else.
Also we have indie cutie vs indie cutie, and right now the shrine maiden is treating Shantae like a spirit to excorcis. She's getting creamed.