Can she kiss her female friend on the cheek when she is fasting?

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Check below answers in case you are looking for other related questions:
Is it Sunnah to shake hands using both hands?
Kissing the hand of one’s paternal or maternal uncle by way of showing respect and honour

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Related Answers:
Sitting with husband’s relatives and shaking hands with them
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Ruling on kissing one’s wife’s mother
Is it Sunnah to shake hands using both hands?
Kissing the hand of one’s paternal or maternal uncle by way of showing respect and honour

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