I Bet 99.99% Will Fail!

Before going to work, Inspector McGill got into the fight with his wife. After coming back from the work he found out that the police was in the home and his wife had just killed a burglar. The police told that she killed the burglar in self-defense. She told her husband the story that she heard a doorbell and thought that it was me and as soon as she opened the door, the burglar jumped into her and she was so scared that she killed burglar immediately with the knife.

Inspector McGill asked the police to arrest her wife for murder conspiracy. Why?

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