Take self-defense training.
Armed and unarmed.
It may sound odd to take the training AFTER the ordeal, but it will help validate her actions and minimize the fear of new encounters.
I recommend the training for everybody.
Second your comment bigtime.
Unarmed self defense training is all she can do. This is Britain, after all.
Even if she had had a gun that day and shot the monster who killed Drummer Rigby, she would have been arrested & tried on several charges, including assaulting a Muslim.