Regarding the hidden mist it is indeed an frightful jutsu by Zabuza. While chiyo is indeed at disadvantage against the mist do keep in mind that the victim is not totally at a loss. As we see against kakashi simply depending on his ninja instincts he was capable of intercepting incoming Shuriken from zabuza within the Mist[
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]. Later on showcased by sakura and the bridge builder their keen sense goes off once zabuza is near them[
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], the fact that Lady chiyo has displayed noteworthy reaction time feats against Sasori sama indicates she would be capable of relying on her keen senses as a shinobi and intercept potential threats from zabuza. Keeping that in perspective zabuza coming making contact with Chiyo is the last thing that he wants to do per say considering
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Keeping that in mind when we take into consideration of her skill set in regards to chakra threads of how she was able to manipulate hirukos tail without sasori noticing[
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]. Keep that in mind Zabuza is at great risk of being manipulated by chakra threads he comes into close contact of Lady chiyo.
Your also not taking into considering of the chakra and prep time needed by Zabuza to activate the mist I believe.
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Now correct me if Im wrong but to my understanding we see zabuza forming a hand seal which to me represents the act of gathering chakra which he did to up until the point to activate the mist. During that time frame not noyl can lady chiyo rush him with her 2 mother and father puppets but also attach threads on Zabuza. Let me just point out that once she sees zabuza start to vanish[
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] this would likely indicate to her that she needs to quickly get out of range of the mist but that is debatable. Anways like I said while zabuza is still present and by present I meant still visible he is still prone to attacks by her puppets such as
wire strings that she used to cut through sasori 1000 hand puppet by the kazekage which would literally slice up zabuza. The puppets within no time can easily surround zabuzas and they can end it their there.
He got in between them with the use of the hidden mist add that with the fact that they were children then obviously he got through them. Being a sensor is non fact here, as long as you have good reaction time skills and keen on your senses they you are capable of intercepting your opponent. You say she wont have time to react just because kakashi barely managed to and then you bring up her not having a sharigan which isnt the point here kakashi and chiyo are 2 different people. It was already displayed in the manga that Minato who doesnt have a sharigan possessed greater reflexes then a sharigan wielder. Anways analyzing the sasori fight she was capable of saving sakura and putting up the chakra sheild and moving the puppet infront of her all before the iron sand drizzle got her[
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]. I wont deny the mist will render her but dont underestimate her keen senses and reaction time feats which are impressive just because she does not possess a sharigan, a women of her caliber is not to be underestimated.
This is agreeable I wont deny what you have claimed regarding her 10 puppets. But than again she can potentially end this with her two primary puppets. I would also like to point out that zabuza uses the sound of his victim to locate them[
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].
The fact that chiyo's puppets will also be making noise may confuse zabuza and he will end confusing chiyo for a puppet and attack the wrong person leaving him vulnerable to getting ripped up by wires or getting attached with chakra threads and chiyo finishes him.