Waiting for a Job offer

Hi,
I had interview last tuesday for an RN position with the nurse manager at the hospital. The interview went well. The NM was so nice and I was really confident answering her questions. After the interview, she told me that she will decide by end of this week which was today (friday). I was anxiously waiting for a call the whole day. Unfortunately, I didnt get any call from NM and HR. So then I called at 4pm today. The NM answered the phone and I asked her if the position is already filled and she said yes. In addition, she said HR will call me sometime next week.
Im just wondering what does she mean HR will call me next week? are the HR people make the call for rejection? or could she mean the HR will offer me a job? Please HELP...really getting anxious
I would have asked her to clarify that. If you know the HR person's name and number give her a call.