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Legally speaking, employment in Kansas is "at will" absent an agreement to the contrary, which means the employment relationship can be terminated at any time, with or without advance notice, and without the payment of severance. You simply need to inform the employee you are letting them go. Legally, you can inform her in writing, over the telephone, or in person--it is completely up to you.
The above noted, for an employee of 16 years it is the decent thing to let them go in person, and to provide two weeks notice so that they have time to look for another job. It's not a legal requirement, it's just the courteous thing to do for an employee who has spent so long working for you. It would also be the decent thing to provide the employee with a letter of recommendation along with an explanation that they were let go only due to office restructuring and not because of any performance related issues.
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