There is no such requirement in Islam. Women like men are to give zakah on their income or assets or savings after deducting the necessary expenses at the end of the year. That is an absolute minimum requirement; they are also encouraged to give voluntary charities; however, it is not obligatory. It is something one merits excellent rewards. Charities can avert calamities; wipe out sins, and can be a source of blessings for us all.
Almighty Allah knows best.
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