Is ascending in an elevator with elderly women, older women, or female relatives considered an unlawful khalwa (seclusion), and is the ruling of khalwa negated when two women are present?

Prohibiting private seclusion (khalwa) is general for every woman who is not a mahram (a close relative whom one is forbidden to marry), whether she is a close relative or a distant one, young or old. Private seclusion is not permissible with any of these. However, private seclusion with two women is permissible if they are trustworthy and modest, as the meaning of khalwa (private seclusion with one woman) is negated in such a case.