I wouldn't worry about her getting your records, but if she is working there... people talk, her and her coworkers. if you were to be admitted she might hear through the grape vine that someone with the same last name is in the psych ward. that happened to me when I was in when I was 17. one of my friends mom worked at the same hospital I was at and she found out I was there and where I was. I was in a very small hospital in a small town and my last name is pretty distinctive. but if you have an ambiguous last name and / or the hospital is very large id say you have much less to worry about.