I find it pointless to comment without having more information.
It'll come down to whether it was reasonable force or not. If the guy was going to kill her, then fine. But if he was begging for his life, unarmed and she killed him in cold blood, then I don't see why she should be exempt from the law. Murder is murder if it's not self defence or by accident.
And the people who are saying people deserve to die for breaking and entering are warped. The punishment doesn't fit the crime unless the person was threatening to kill you. But according to some people here, someone with the intent to steal something of value and leave is worth someone's life.
And you wonder why your country has such a violent culture.