When necessary, women are required to fight, for example in wars of self defense. As they are included in those addressed by the verses on this type of war:
يا أيها الذين آمنوا إذا لقيتم الذين كفروا زحفا فلا تولوهم الأدبار
O you who have believed, when you meet those who disbelieve advancing [for battle], do not turn to them your backs [in flight].
— Quran ...
Jihad literally means "struggle" or "resisting". Within an Islamic
perspective, it is "striving in the way of God (al-jihad fi sabil
Allah). [Copied from the tag title on this site]
Women are encouraged to participate in jihad (Bukhari 1861):
Narrated Aisha (mother of the faithful believers): I said, "O Allah's
Messenger (ﷺ)! ...