Adjusting To New Work Place

Hi, I just moved to a new place and have a new job. I am looking forward to establish my work flow(I am a physician). Things are done differently in current place. In one of the situations, my colleague(another physician) reported it to my chief without talking to me and I had to do a meeting with chief and everything was kosher. It is more of communication gap. I am pretty confident that I can resolve with my colleagues but I am struggling with the behavior of my colleague. She is a sweet person but she reports things directly to admin without talking to me. I am afraid to discuss anything with her now. How can I change my thought process? Thanks.