Would you like to help solve this question?

1/ She is a trained boxer. One night while she is sleeping she hears a scream for help coming from the apartment next door. She jumps out of bed and rushes to the aid of her neighbor. The door is unlocked so she is able to enter the apartment. She fends off the husband who is attacking his wife. Later the husband wants to prosecute her for trespass. What defense will be available to her?