how would you say "she is known as"
as in, "she is known as a symbolic mother to the mexican people"
Your main question is "How would you say 'she is known as' ". It looks like Icanrideawave has left this out of his reply. Other observation I have on that answer are that his reply suggests she is the only symbolic mother and "gente" has been treated as a masculine noun when it is really a feminine noun.
My suggestion for a translation of your sentence is:
"Ella es conocida como una madre simbólica a la gente mexicana."
Para la gente mexicana, ella es conocida como un símbolo maternal.
Ella es conocida como el simbolo de madre mexicana
Ella es la simbólico madre del mexican gente