Employee who drives me nuts!

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explain to her that if she continues this way, she will get fired. she does not need to know that you can't really fire her.

Also, talk to this manager, he refused to fire her, but then he complains about her. Talk to him again, remind him that you want to fire her and she is a problem in your department and she does not fit in.

You need to take a stand make them understand that as long as you are responsible for your crew, you need to be able to fire (and hire).