She's treating you like this because nursing is a very demanding profession. Some people will always have different opinions than yours. You need to choose what your priorities are.
You should think long and hard about what specialty you want to go into since you already have the degree. Nursing also is not for everyone. This also may also be something to consider. I know if I was the nurse manager on the unit you tried to get a job on I would not hire you with the attitude you have towards patient care. Quality patient care is the foundation of good nursing practice.
I am about to start working towards becoming a FNP in Fall 2015 by taking some non matriculated graduate classes. I have taken graduate level work before but it has been quite a few years. Any wisdom for success from currently enrolled students?