IF she has a contract - if she is in a union, for example - then the answer is no. However, most employment is "at will". There is no employment contract to speak of.
Its too bad this becomes the option of choice for the employee, on the other hand, its too bad the employer couldn't manage to voluntarily treat its employee with some measure of respect and consideration.
I know they aren't legally bound to, but IMO its always a better policy.