I don't think there's a solid general list of 'moves to never ever use'. A bunch of her moves are situational and give really good stuff if you use them correctly. Even the uber unsafe 66K has its uses, being a quick horizontal advancing kick attack with evasive properties and decent damage. And I must disagree with Kosh on not using 8_9KKK ever. It punishes a bunch of newbie staples rather efficiently, like Amy's 3BA. Sure, you can use 9B, which would be what I'd prefer myself, but I guess it's up to the player to decide which of her moves are bad in a situation, and which moves are good. Even great moves like WS K become not so great if used excessively, especially against another Taki. And last I played him, AkuSokuZan was having decent success at connecting with 4B. I dunno if he still is now, but he was using the move at the right times last I saw him play.
Basically it's all about getting to know her well enough to know which moves to use, when to use them and who you're using them on. That last part is often overlooked.
So... The hammer you should be learning how to use is the proper mindset. Who am I up against? Are they trained enough that I can go for the kill and stop poking? Am I getting too predictable and how do I solve that? What's the core of their game, and how do I counter that?
There are a lot of other questions you should be asking yourself in a match, and each question will lead you to different moves to use. However, I do suggest using AB as a starting point for your game. Take advantage of her ridiculously fast A and see what you can do with that.
