Some states do mandate school nurses. Some mandate a school nurse in every school with a minimum level of education, others mandate one per district - which can be 1 nurse to 10,000 - that was the worst I ever heard. The National Association of School Nursing and Healthy People 2010 recommended 1:750 well children, 1:250 chronically ill children, and 1:125 medically fragile children. The minimum level of education recommended by NASN is a BSN, however, many states do not require extra training or a college degree. Some states do not require an RN, an LPN is sufficient. In California, an MSN is required.
Florida does not mandate school nurses, nor do they mandate a minimum level of education to be a school nurse. However, the school should have notified the parents that there was a change, and either temporarily or permanently, that there was no longer a nurse at the school - I would think that this, and the decision NOT to replace her, would have been public domain as part of a school board meeting. I am not sure how you found out the teachers lied to you, but in many schools, the teachers simply may not have been told the straight scoop.
Parent protests and demands for nursing coverage are often the best way to reinstate nursing coverage in a school. Research has shown that non-licensed personnel in schools send children home at a significantly higher rate than RNs. RNs have assessment skills that allow them to determine if somatic complaints are supported by physical symptoms. RNs, therefore, contribute to less time out of class and fewer inappropriate calls to mom at work that an aide or a secretary. These are issues of importance to all parents, those who care about child education and achievement, and to employers in the community - I do think you could get a grassroots campaign going to get nursing coverage back in your building.
The following persons may be able to help you.
Florida Association of School Nurses
Florrie Deaner, RN, MSN, NCSN
Executive Community Health Nursing Director, Department of Health
Sylvia F. Byrd, ARNP, MPH, NCSN
School Nurse Consultant, University of South Florida (in collaboration with the Florida Department of Education)