The changes sometimes come only after a year. Then, all depends at what age she was sterilized. If she was young - she should have kept her puppy temperament, but, if she already had this sort of attitude towards your male - she would keep it, th possibility remains. Sometimes the males keep stereotypes, they like to fight and they continue to fight, their owners are waiting for changes and the changes never come because it was too late, their character matured already. But, that happens very rarely. Another possibility - nothing happens to her and she is looking for a way to get rid of her frastration. You should exercise her a little bit more often.