Some of your problem might be your predecessor - perhaps he or she was very content to do clerical and low level work as opposed to health promotion and illness and injury prevention?
Does your name tag have your credentials on it? Is your College diploma hung on the wall? how are you dressing? As good as teachers, as good as your education?
I agree with previous post re resoruces - so others:
Bays, C.T. (1991). The school nurse: Enhancing professional recognition. Journal of School Nursing, 7, 18-20, 22-4. (oldie but goodie)
Brandt, C. M. (2002) Enhancing school nurse visibility. Journal of School Nursing, 18, 5–10. (availaable via web
www.nasn.org)
Start filing a monthy report with your principal so she / he knows what you actually do. You can use this tool as a guide for what to include:
Tustin, J., Canham, G., Berridge, J., Braden, D., & Starke, T. (2002). Professional development and appraisal system for school nurses. The Journal of School Nursing, 18, 229-236.
I would prefer to be full time in a school with lower needs than part time if there is not enough to do. In my last position, I was asked to write grants during my down times and was able to bring some very valued dollars for the health program. You need to make sure you are perceived as a team player. In most districts, the teachers and principals all do a little of babysitting, dress code policing, hall monitoring, and secretary work. If you are not busy, it is hard to object to pitching in. Volunteer for those jobs that can enhance your status and your ability to assess the children and the environment. Have you conducted the SHI needs assessment yet - what needs are unmet?
http://apps.nccd.cdc.gov/shi/default.aspx
So plan each night before you leave what you need to accomplish the following day - until your work is not getting done, work that makes the school run better and enhances the kids learning, there is no reason for them not to expect you to help out.