I haven't seen any of her WWE run so I can't really comment on how they've handled her, but there's no reason to me that Jade couldn't have been a main event level star immediately.
Warrior didn't need 5* matches to main event Wrestlemania - he needed the look to fit Vince yelling about Greek Gods, he needed a clean flying shoulder tackle and a gorilla press and he needed a good theme song. If he hadn't been a total twat, which Jade doesn't seem to be, it would've worked for years.
You just build on what AEW did for her - she was undefeated and only beaten when she was goaded into a second defense against another hoss right after beating the #1 contender. Even doing the favours on the way out she was kept strong as hell.
So you just bring her in with all the aura of a demi-god and set her up against women who can make her look great... if the neckbeards hate, then let 'em hate and watch the money pile up.