My mom is an ESFJ. The only factor that ever gave me pause (and consideration of ISFJ as a possibility) is her tendency to avoid excessive socializing with people outside the immediate family, but I believe that's due to some rather serious self esteem and depression issues that transcend her personality type. In other words, I think she would very much like to be a social butterfly, but that desire has been suppressed by decades of poor self esteem and constant worrying about what everyone else thinks of her. There's no question in my mind, however, that she leads with Fe. There is never a doubt as to what emotional state she is residing in at any given time, she is prone to histrionics when she doesn't get her way, and her foremost concern in life (no exaggeration) is maintaining the perception in others (i.e., those outside her immediate family) that All is Well® and that she and the rest of her family are perfectly normal. In fact I believe it's that very need to always keep up appearances with the neighbors and extended family that has led to her problems with depression and poor self image.
There are positives. She's very good with money, is a quick learner and has an exceptionally sharp memory for someone her age (Si). She's an exceptional caretaker and can have a very charming personality and sense of humor when her mood is right. She does however tend to overplay the caretaker role to some extent, and will sometimes use it as an excuse to martyr herself if things between us aren't going the way she expects them to (i.e., "I've done SO MUCH for you over the years!"). The dilemma is that she has a strong need to be that caretaker, but she also expects more in return than just your eternal gratitude - she expects her hard work and sacrifices to pay dividends in other areas. Again, her foremost concern is to avoid any possible embarrassment and ridicule from outsiders, so if something happens in my life which could potentially cause that for her, she takes it as a personal offense.
This obsession of hers has resulted in a strong need to control the flow of information to the outside world, which invariably translates into a need to exert direct control over members of the family (dad, sister, me, and while they were alive, my grandparents) via emotional manipulation. When my sister and I were kids, the control mechanisms also went beyond manipulation and into direct, invasive intervention in our lives. Basically, we had no privacy and were granted very little respect or autonomy. Her fear of looking like a bad parent even extended itself to the subjects we took in school - she discouraged both of us from taking challenging science & math classes because we might not make "A's" and our names would therefore be left off the honor roll in the newspaper, which she would presumably have to answer for. Obviously, the worst punishments she could dish out were reserved for the (rare) times when we publicly embarrassed her or the family reputation in some way.
I know it sounds like I'm exaggerating or beating a dead horse. Honestly, there's not enough bandwidth on this site to tell enough stories or analyze this enough to do it justice. My dad and I have spent countless hours doing just that and we've barely scratched the surface.
As to the OP's question - yes, she has somewhat colored my perception of ESFJs, although I am quicker to indict her obvious mental health issues than her cognitive functions. I've met plenty of ESFJs who don't act (exactly) like she does.