As long as it is not for sale, there is no zakat except on the rent you receive and it’s earnings with you for a lunar year.

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No problem. https://www.youtube.com/watch?v=eTuWUJHi3Lg&t=99s

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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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