If they are Muslim and have been informed about Allah’s order, they are sinful for not covering.

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Men must not see your feet without socks. The most authentic opinion is that she must also cover her feet when praying.

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This is not permissible. She must wear a lose outer garment, I.e. an abaya that covers her entire body including feet.

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You can use perfume at home and not in front of non mehram. It has no effect on salah.

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This is permissible. Kindly refer to the following link(s): https://www.youtube.com/watch?v=rAvn7lo_HaA

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This is up to Allah to judge them as their prayer and fasting would admit them to paradise while not wearing hijab will admit her to hell. She might spend sometime in hell until she is purified from her sins and then admitted to paradise.

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