ANSWER: She should wash the exposed part carefully and then wipe over the cast. But if this would harm the cast, she can perform wudhu without washing the toes. 

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ANSWER: It’s valid as saying bismillah is not mandatory before making wudu. 

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ANSWER: It does not impact the wudhu to touch anything other than the private part, and that is an issue of dispute whether touching it without desire affect the wudhu or not.    

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