PNP References?

Hello all. I am in the process of applying for a Primary Care Pediatric Nurse Practitioner program and need 3 references. One must be from someone in a position to evaluate my job performance so I asked my current supervisor who isn't a nurse but does do formal evaluations of my work each year. I still need two more. The problem is that I work as a school nurse which means none of the other people I work with regularly are healthcare professionals. I haven't worked in a hospital in over 5 years. I have emailed my former patient care manager from my last hospital job as well as the former Nurse Educator who guided me through a 2 year new grad program but that was 7 years ago. In your opinion should I ask my current colleagues, who are mostly teachers, or focus on healthcare professionals even if it's been many years since I worked with them? I could also ask one of my fellow school nurses who I have worked with for 4+ years.