Welcome to Yorkie Talk. I agree with Gemy, sounds like Izzy has the standard Yorkie coat, straight and silky.
Do you have a picture of what you are trying to achieve? Sometimes adjectives like "fluffy" can mean different things to different people when describing the look of a dog.
If you want more volume in her coat, I would try Chris Christensen's Day to Day or #1 All Systems shampoo and conditioner. Both can be purchased online.
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