You can always give her sadaqah. As for zakat, this depends whether if she dies, whether you would inherit her or not.

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As long as it is not for sale, there is no zakat on it. Kindly refer to the following link(s): https://www.youtube.com/watch?v=43z0Bpfao-M

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No, jumu’a prayer takes the place of dhuhr. Doing so is an innovation.

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You are supposed to say that if you pray alone or you are the Imam. The follower only says: rabbana wa laka Alhamd.

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