I wish we could ask Jack Olester about her appearance, but Misty Taggart wrote that episode. Maybe he does know something.I still think something was screwed up in NA and She-Ra was supposed to visit He-Man and they accidentally said "Teela" or someone saw She-Ra and thought that WAS Teela.
Unfortunately the nature of Adora/She-Ra is that she has to be this "Everything you know is wrong; you really have a sister that we never told you about" reveal. While The 'Ra is absent, Mattel can use Teela is the alpha female.If MYP had continued, She-Ra would have been introduced. It was cancelled before she came into the picture. She always has to make a grand entrance.