Looking for some advice. I have an employee who is very good at their job, can be relied upon and could go far in her career, however, she is becoming more and more unmanageable. She has always had a habit of being extremely detailed about things and becoming over involved. We manage contracts and sometimes it feels like she actually tries to manage the delivery of the contract. This means that she spends far too long doing simple tasks, so does half the workload of anyone else. But complains she has too much work and can't do any more.
When I try to work with her to talk about this, she gets defensive and has started to become more and more passive aggressive. It is starting to impact others. She rolls her eyes and huffs in meetings and I'm at the end of my tether with her.
Any ideas how to approach this. I am starting to dread working with her.