She likes keeping to her self?

we are collegues ,we share the same office when i got to the company newly,later i was given my own office,which we were given one system to make use of,the system was in my office because her office was small,when she had that the system will be in my office,she said she will never make use of it that she can do without it,but she didn't keep to her words she resume to my office and close there ,before i was given my own offfice it was hell with her,because she will just keep to herself if u ask her why she will tell u that her nature ,customers complain,other staff complain,but to me i was patient with her ,their was a time we were given a bag of rice to share,she went to the m.d that why will the manager gave me and her one bag to share,but i think the m.d insulted her,as for the system,i always allow her to make use of it,now am back to her office she has started her behaivour again,this time if i touch the system she will be annoned.pls advice me am tired of her behaviour.

Go to your boss and tell him that she has a bad attitude and it is interfering with the quality of customer care. If the customers can sense her bad attitude, then you could be losing business. I'm sure the boss doesn't want to lose customers because of someone who's not a team player.