PHN Poorly defined and understood role

It would be safe to say that I'm new to public health (less than a year) in a newly created position working for WIC. The primarily nutrition staff have a limited focus. Mine is broader. For example, as I do hemoglobin testing, part of my patient education is necessarily about iron which does overlap with nutrition. While I see it as a nursing function to educate about everything within my scope, especially when asked, the nutrition staff (unlicensed) feels it to be their responsibility alone. They would be happy if all I do is fill out forms and test for hemoglobin and keep my mouth shut. I'm fighting for the integrity of my profession, as well as for optimal outcomes among the population we all serve. It's extremely frustrating. Very poorly defined role. I'm curious if other nurses experience this. I realize that I may be kind of unique in that I'm only one nurse in a large department of non-nurses, but what I do here will have an effect on whoever follows in my footsteps when I retire and hopefully the public health.