Only if you consider her to be a mindless animal. In order to truly protect your children and effective defense must be brought to bear, standing around just waiting to be beat up so that he can proceed to your children is the mindless action of an animal, not one of a human. If you know it will not be effective, then you return with more effective means to protect your children. Dying or being crippled is not an effective option, even you can understand that.
Did she call the police after leaving? Did she return to protect her children to find that they were in danger?
Apparently the jury didn't believe she did, but I cannot fault her logic. I would return, do what is necessary, then face whatever consequences I may have to face.