What am I doing wrong?!

I have so many questions.

How exactly does the hiring process work? Who's in charge? What is a "hiring manager"?

I just graduated nursing school (ASN), plan to take the NCLEX ASAP. I have zero healthcare experience, left the Air Force to become a nurse, haven't had a job since (4 years now). I received a scholarship from the hospital (health system) I want to work for, have applied to several RN I and RN II positions and haven't gotten a single phone call. The terms of the scholarship are that I have to begin work within 4 months of graduation and almost an entire month has passed. I have gotten in touch with several HR recruiters, one of which is the POC for the "list of scholars" who recently submitted my name for a position, for which I never received a call back from the "hiring manager". I have contacted this individual (POC) several times and every time I talk to her she tells me really busy and even told me the last time that I talked to her that she has no control over the hiring process. I have contacted PCD's as well and they all tell me to go through HR. UUUGGGGHHHH

What am doing wrong? I got a scholarship from the hospital and they won't even hire me. There has to be something wrong with this picture. Unfortunately the scholarship does not guarantee you a job, so I may find myself jobless and paying back $2,500 in a couple of months. I'm freaking out.

HELP!!! What can I do??!?!?! Is there anything I can do?