Wa alaikum assalam, If this was in the final tashahud, you prayer is invalid. If is was in the first one, you should offer sujood Assahu.

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Wa alaikum assalam, She must remove all her jewelry and she must not wear beautiful clothes – white is not a must, they can be black, green, blue, etc but they must be simple.

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Wa alaikum salaam, Giving sadaqa is permissible. However, this is not recommended as if they can’t afford it, they shouldn’t go.

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