It is recommended to send the weak among women and others ahead from Al-Muzdalifah to Mina at the end of the night, before it gets crowded, but it is recommended for others to stay there until they have prayed Subh in Al-Muzdalifah
حَدَّثَنِي مُحَمَّدُ بْنُ حَاتِمٍ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، ح وَحَدَّثَنِي عَلِيُّ بْنُ خَشْرَمٍ، أَخْبَرَنَا عِيسَى، جَمِيعًا عَنِ ابْنِ جُرَيْجٍ، أَخْبَرَنِي عَطَاءٌ، أَنَّ ابْنَ شَوَّالٍ، أَخْبَرَهُ أَنَّهُ، دَخَلَ عَلَى أُمِّ حَبِيبَةَ فَأَخْبَرَتْهُ أَنَّ النَّبِيَّ صلى الله عليه وسلم بَعَثَ بِهَا مِنْ جَمْعٍ بِلَيْلٍ .
Ibn Shawwal (the freed slave of Umm Habiba) reported that he went to Umm Habiba (the wife of Allah's Messenger) who informed him that Allah's Messenger (ﷺ) sent her from Muzdalifa during the night.