Sorry that you seem to have such bad luck with your employees. You can definitely put in there that this is a warning and that any future similar behavior will result in her termination. This would benefit you if she is terminated and files for unemployment benefits.
As an at-will employee, you can discipline her for any reason at any time with or without any prior warning, and can terminate her for the same reasons. As long as her relatively erratic behavior is not due to a known or suspected disability, there is nothing preventing you from disciplining in any way you see fit or terminating your employee.
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