Sheik in OOT was only a invention,a fake, a halloween outfit, zelda use this outfit to hidde from ganon, in TP we have a diferent zelda than zelda from OOT, sheik haven't place in TP,cant be part of the story, sheik cant exists in TP because zelda from OOT die, like Link and the most of characters from OOT die.
OOT(100 years and more)TP.

Sheik isn't an "invention." That doesnt even make sense. She's not a "Halloween outfit" either.

And, yes TP zelda is different than OoT Zelda, but that doesnt mean she could transform into Sheik. Zelda from OoT just used her magic to do it. Zelda from TP has magic, therefore also has the ability to do so as she wishes.


But TP's plot doesnt involve a need for Sheik, so she's not shown.