I need some opinions on what happened at work. I recently started a new job a few months ago and re-adapting to a new environment and completely new field has been hard, although all staff has been really friendly and welcoming.
Another person has started recently as well although she has worked there before (two summers, two years running). She was doing some invoicing and called me over to her desk several times to explain things I has written and other things she was uncertain about how to invoice. I replied and once stayed near her desk as I was looking at the notebook she was invoicing from. She said really coldly that my presence there was really annoying her. I wasn't looking at her screens or really close or anything, just curious as to how the work was written down. I was really thrown and explained but quite upset as I found it quite rude. I did say it was good to say so. Obviously I wouldn't want her to feel uncomfortable and perhaps I didn't read the situation well. She later called me over again, and questionned me about something, being quite accusatory, as if I had made a mistake, which I didn't, so I asked her how she would do things. She didn't really know either and I'm afraid I got quite annoyed and walked off grumbling. I shouldn't have reacted that way and feel really bad if I made her uncomfortable, although I don't think I did anything particularly offensive. Should I apologise for something that happened last week or just be polite and hope that things will smooth over?