Just make sure not to do her job for her and she won't last long.
Had one where I used to work, everyone pulled her weight, everyone knew she was being pulled over these except HR and she ended up getting a management position in another area. Oh the shock when they discovered she couldn't even show up for work on time let alone write a complete sentence. She didn't last a month and we managed to fill her position so she couldn't return. I gave her a friendly wave as she was picking up her last check with a scowl on her face, SO satisfying!
They are kept on or they sue for discrimination.
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