The current level of Life Energy she possessed could hardly be used to defend herself properly and it was even more unwise to use them on civilians who were just doing their duty.
The moment that a Balancer started to cause public displays of their abilities without restraint was when the others would come to know of her status as a Balancer but what resulted of that would be so much worse.
Balancers had their own rules and secrecy was what they aimed to keep.
Using spells and other abilities on civilians or in a public setting was like asking for trouble since it would risk exposing the secret of the world to the masses.
When a secret society wished to remain secret, they made certain to silence who needed to be silenced and kill whoever posed the biggest risk to exposing everything.
