The Stoopid Unikorn
Spiciest of Guacamoles
As someone who's played both game, I think this would be a great way to handle her.Elaborating on this a little, her neutral game was probably supposed to be a lot worse than it ended up being. Back air was far too strong an option for spacing and whatnot, and down tilt initially had stupid levels of reach.
Make her run slower (seriously, she's not a fast runner in-game until you get Panther Within.) Make her moves harder to hit unless you're on top of an opponent. Give grounded Witch Twist the windup that it has in-game so it can't be used without risk. Give her more 50/50 options like Sheik instead of confirms. Make her neutral lackluster to make up for having such a good combo game.
Makes her less of a ridiculous character while also being a more accurate portrayal of how her games are played.