I have an employee who walked out of the office shouting I quit. My colleague had picked her up on a piece of incorrect work that was a serious mistake . She wasn't disciplining her she was discussing the error and how to move forward. The employee lost it, threw her keys at my colleague and walked out. She now wants to come in on Monday to discuss. I don't want her back. As she walked out is this classed as resignation therefore she doesn't serve notice and I don't need to pay her