Mei has large scale Suiton to block the Gold Dust such as her Water Release: Water Encampment Pillar which has been able to put out one of Madara's huge Katon, and can quickly switch to offense and can use either Water Release:Water Dragon Bullet
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or quickly use the hiding in mist jutsu and combine it with her Boil Release:Skilled Mist technique to make the mist even thicker and attack the Kazekage with her Lava Release: Melting Apparition Technique.
Also Mei's Yōton doesn't require multiple handseals and she would be able to fire two Yoton Jutsu and one Yoton is equal to 1200-1400 Fahrenheit two would equal 2400-2800 Fahrenheit which would be enough to melt the gold dust and her Yoton has already been shown to melt Madara's Susano'o bones
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and
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and her Futton can also melt defenses as strong as Susano'o evident as when she melted Sasuke's Susano'o ribcage
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and the Fuuton is very acidic and can render defenses useless especially as Mei can adjust the PH Level of it making it even more acidic.
Also Mei's Hiding in the Mist Technique
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enough to cloud up the Rinnegan's field of vision and the Fourth Kazekage wouldn't have a clue to where Mei is especially if she makes the mist even thicker then attack with a huge Water Release:Water Dragon Bullet technique. Mei has good chakra reserves being able to have mastery over two Kekkai Genkai and in the battles we have seen her in she is able to use multiple jutsu without showing signs of exhaustion and has been able to do large scale Suiton without a nearby Water source which will be very useful against the Kazekage as her Suiton would render his Gold Dust useless.
Also if Mei gets close to the Kazekage she can use a short range surprise Yoton or her Boil Release:Skilled Mist technique to melt the Kazekage from close range and also Mei has good reactions being able to react to Madara's jutsu on more than one occasion and is quite skilled in Taijutsu being able to send Black Zetsu flying from a kick
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