She is stronger than Popeye, higher-flying than Superman, more reliable than Captain Planet, and more incredible than even Mr. Incredible; she is my mother, my superhero.
Instead of being passive here in your language, why not lighten it up more and use active, more imagery-evoking verbs? Verbs are awesome!
Here's my version! (of course, you SHOULD DEFINITELY change it to more of your voice seeing admission officers are amazing in their discerning changes in voice and inferring that someone has drastically helped you.
Easily beating Popeye in an arm wrestling match, out-flying even Superman, and being more incredible than Mr. Incredible, she is a mother--my mother, my superhero. (I took out the Captain Planet because I don't really get that and three's the charm :-)
It's not every day you find a person that is able to both inspire and impact you.
In my opinion, inspiration is making an impact on someone.
Generalizations, in my opinion, can sometimes be offensive to the reader if it contradicts him although you include him as part of "Americans"
Also, to answer your question, yes, you should definitely talk about you more; how she has changed you rather than who she is. This isn't a "My Hero" essay but rather "YOU" essay.