Can I Ask The Police To Trespass This Person?

Location: TN. so, weird situation. I own a business. Without getting too far into it, we store and deliver propane. There is a fence around two sides of the property, the 3rd side is a forest and the 4th side is a small river. The fence is closed and locked outside of business hours. I have an employee that stays on the property overnight. He has a space (the shop) to watch tv or sleep if he needs to. The building has electricity but no running water. Two weeks ago, a friend of his showed up (during business hours) and moved her stuff into the building. My employee was not at work that day. This woman did not speak to me that day in any way. I am conflict avoidant so I did not confront her. At that point, I did not know if she had gotten permission from my employee. She had not contacted him either. She has now been staying there (in the shop) for two weeks. I have tried to let my employee handle things because she is/was a friend of his. She has no car, no house and no money. I have told him she has until Wednesday this week to leave or I am calling the police and having her removed.

Do I have to give her any more notice than that? I have already called the police on her once when she stood outside the locked gate for an hour ranting and raving. When the police showed up, she told them her little dog had gotten inside the fence and she was trying to get it to come back. I think she was hoping my employee would come and unlock the gate and talk to her.

I do not have a pleasant relationship with this woman but I do want to keep my employee. He wants her gone as well but she just won't go.

I just want to make sure I am doing things the right way and not waste the deputy's time.