The Sunnah is to say Assalamu alaikum. However, it is permissible to say such words.

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You should tell her that this is not permissible in Islam and try to be respectful as much as possible.

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  If it was unintentional like a person touching a woman by mistake in the street or elsewhere without intending it, this is not a sin. But if one extends her hand to shake hands, you shouldn’t shake hands or touch anyone.

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