"My administrator, recently left and went to another job. However, she still works part time at my company as my boss. I recently applied to a larger company, my boss now works at this company. I know the hospital she works at, but I chose to apply
to another hospital."
I think the above is what is so confusing. If you want a part time job, go to the interview. However, this may cause issues with your current boss. She may fear more short staffing. I say do what is best for you, she did the same.
I am confused about how she knew, do you think she could have seen you or someone else saw you.
"She then text me back an hour later to ask if I was aware that she also worked at this hospital when her hospitals census was low. I did not know this, or I would of applied somewhere else."
The above statement is also confusing, first you say you knew she worked there and then you say you didn't or you would have applied elsewhere..