‘Maybe I’m leaving, maybe I’m not’: What do to if they have one foot out the door?

Q: “If an employee states that she is supposed to hear in the next couple of days if she will be offered a new job at another company in the same field, can you consider that a two-week notice? Secondly, should you now look for a replacement for that person? Can you fire the employee if she actually does not get the other job? Do you have to wait for her to officially get a new job before taking action even though you now know she is actively looking for a new one?” – Joy, Pennsylvania