It is never a great situation to have a full-time employee who seems to be working part-time. Some employees keep taking more and more personal time off until they are told to stop. In a word, your employee needs a stop sign.
You should meet with her and discuss the situation on an open, candid, and professional basis. Let her know that you regard her as an excellent employee, but you are concerned about the amount of time that she is spending on personal business away from the job. You should be prepared to provide her with some specific examples.
Although you can come up with steps to correct the problem, such as by indicating that she needs to make more personal appointments during non-work hours, it will be more effective for her to develop and commit to a specific plan to correct the problem. When employees come up with their own plan of improvement, they are far more likely to follow it.
If your employee shows some real improvement, be sure to give her positive feedback for doing so. After all, it should not be that difficult to find her.
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