Why Nya didn't learn Spinjitzu before Season 6 + Morro's Spinjitzu Theatrics

stupid theory ignore me or not... nya probably didn't learn spinjitzu because either, Nya was under the impression that you require element powers to perform spinjitzu Early Master Wu was unjust with Nya and didn't want to teach Nya spinjitzu, staying in line with his dismissive nature of Nya early on, such as when she attempted to go with the ninjas, only to be denied by Wu Nya feared learning spinjitzu because of the possibility of failure, staying in line with her biggest fear at the time...