لِتَذُودَهُنَّ وَأَيْقَنَتْ إِنْ لَمْ تَذُدْ أَنْ قَدْ أَحَمَّ مِنَ الْحُتُوفِ حِمَامُهَا
She fought to drive them off, certain that failure to resist would mean that her appointed death was near.
Tadhūduhunna means to drive the dogs away, ayqanat she became certain, aḥamma drew near, and ḥimām death.
In lam tadhud makes the condition explicit: without resistance, death will follow. Her combat is self-defense, not an attack for its own sake.