Having every tool and being good at all of them is a bit of an exaggeration. She doesn't have strings that can grab after the opponent blocks it (Tina, Sarah). She doesn't have ground grabs (Bass, Bayman, Tina). She doesn't have a guard break that guarantees anything (Christie). And quite a few others.
Her sitdown stuns are mostly useless. She's hard to land a limbo stun with. Her respectable mid launchers are quite slow. Her best tools are for defense. Her offense, although she can be very effective, is not as great as other characters.
Doesn't mean she's not one of the best in the game though. You just made her sound like the most powerful in the game, while she really isn't. And I agree she doesn't need buffs. Not sure about nerfs either though. Not when there are characters like Sarah, Christie, Ayane and Gen Fu around. Unless they get nerfed too.