Ann, I wouldn't say the starter becomes fluffy, but it should puff/expand a bit; it should look like the photo in this post. If it's not doing anything, then try putting the starter in the oven with the electric light turned on; that should provide enough heat for the yeast to start doing its thing. And if that doesn't work, then I'd suspect the yeast simply isn't as active as it needs to be. Good luck — PJH@KAF

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