I've been in distress for the last several months because of this. My PhD advisor somehow decided to start her own field research in the same region where I have been working on for a few years now. Then when I was doing my fieldwork last time, she was there too and she used the same resources I have - contacts, measurement equipment and lab, etc. It became awkward for not only us but also for other researchers involved. Even worse, once I told her that I wouldn't be able to help 'her' project (I'm busy with mine!), she started cutting me off from my resources, withholding information, etc. She's still my advisor and I am wondering where I should go from here - too late to change advisor but this is getting too toxic. When I consulted other professor, he said it was pretty normal that multiple researchers do similar researches at the same time in the same region. But is it common between advisor and her student as well? Any advice will be appreciated.
PS: I have my research fund. Although my advisor wrote recommendation letters for me to get the funding, I've never been her research assistant.