How do I help an employee establish boundaries between her & a female co-worker who won't leave her alone?

I supervise 2 women who share an office. I'll call them Jane and Julie for purposes of this question. They get along well. Jane is a people pleaser to the extreme. She is being taken advantage of by Julie who constantly interrupts and asks questions she should already know. This affects the productivity of Jane. Julie has been thouroughly trained but seems to not retain much of what she's been taught. I realize that is a performance issue that needs to be dealt with. But I think I also need to help Jane establish some boundaries with Julie. How do I do this and not adversely affect teamwork and morale? I believe that Julie can perform her duties without the constant intervention from Jane. I hesitate to use the word 'lazy' but so much of what she asks she could figure out herself with just a little effort.

You should take care of the issue with Julie. Jane is just trying to do her job and help. If the problem lies with Julie maybe u need to look for a replacement.

I worked with a girl that did that and they kept her on because her mother worked for the company and she ended up stealing and quitting. It was stressful to the entire work department to have her there and it slowed my productivity as well as others.

You can't expect Jane to fix it, she can't fire her.

If u let this continue it will just get worse and start effecting all.

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Since I really haven't answered your question, it is not necessary to give me any points. Regards.