It is very possible that she may not allowed to be tell you which applications--including yours--were routed and to where.
She may also be minimizing how much she discusses these things with applicants for several reasons: she's got a lot of applicants, she doesn't want to give anyone false hope, she doesn't want to make anyone lose hope, she may be too busy, she may not have any more say in the matter, it may not be her place to tell applicants they have been hired/rejected/have HR issues, etc....
While I'm not saying to give up on this place, the NM was right in her remarks about continuing to apply for other jobs. Never give up the job search
until you receive an official job offer from a facility. No matter how promising the interview(s) are, no matter what the nurse managers may tell you, no matter how much you feel this job is "the one," until you get that official job offer, you do not have a job.
So keep looking until the very end.
Best of luck, be it with this facility or elsewhere!