Ibn ‘Abbas said “Umm Hani daughter of Abu Talib told me that in the year of the conquest she gave protection to a man from the polytheists. She came to the Prophet ﷺ and mentioned it to him. He said “We have given security to those to whom you have given it.”  

حَدَّثَتْنِي أُمُّ هَانِئٍ بِنْتُ أَبِي طَالِبٍ أَنَّهَا أَجَارَتْ رَجُلاً مِنَ الْمُشْرِكِينَ يَوْمَ الْفَتْحِ فَأَتَتِ النَّبِيَّ ﷺ فَذَكَرَتْ لَهُ ذَلِكَ فَقَالَ قَدْ أَجَرْنَا مَنْ أَجَرْتِ وَأَمَّنَّا مَنْ أَمَّنْتِ  

A woman would give security from the believers and it would be allowed.  

إِنْ كَانَتِ الْمَرْأَةُ لَتُجِيرُ عَلَى الْمُؤْمِنِينَ فَيَجُوزُ