How to deal with an angry co-worker?

I work in an office and have recently finished my bachelor's degree, which has caused my boss to delegate new responsibilities. A co-worker who shares my office and used to be a friend now gets extremely angry every time I do something "special" or answer a question from an area she considers "her turf." She has been in this department for about 20 years. I am super-busy and don't have time for this nonsense, but she is beginning to make me angry because she slams things around and gives me the silent treatment. It's annoying. Plus, my boss does not like making this person angry, so the boss may end up backing down on the new responsibilities, if she thinks this person is upset. I am being actively recruited by another department and although I really like my job and the new areas I am working in, this person is making me miserable and I'm thinking about moving. I hate to leave a job I like, just because of 1 person, but this 1person may prevent me from having a job I like.

Sounds like your co-worker is jelous of all the extra attention you've been getting from your boss because you're more qualified than she is. It looks like you have a few options you could talk to your boss about the issue and ask if there's any way you two could be split up as it's affecting both your work ethics negatively. You could approach your co-worker and explain that you're not trying to step on her toes you're just doing your best to help out your boss and it has nothing to do with her personally. If none of those work I guess your best option would be the other job. I know if this was my problem though I wouldn't let someone else make me leave a job I loved I'd do my best to work through it by being open and honest with the other parties involved.

Standard Management gimmick: "JUST DON'T DEAL WITH THE GUY"...

well, sorry boss, but looks like it just comes from experience how to deal with people. hang in there and guess it should be alright for you. As told, just don't deal...

if your boss refuses to speak to her about her attitude, go higher until you are satisfied. you shouldn't have to deal with such childish behavior.

It sounds like your boss might not be able to help you so you need to review things with your HR dept (but I would mention these problems to your boss first). HR should be able to help you cope with the situation even if the coworker hasn't really done anything specifically reprehensible.

You need to tell your boss what is going on, it is his/her responsibility to deal with it. If you want, you could confront your co-worker and explain that you are not asking to take her work away, that your boss is requesting it of you. If neither one work, you could always talk to the human resource department. It sounds to me like your co-worker needs to grow up.