Unclear question. However, I inferred the actual question to be;
What is the antecedent of the pronoun? Mrs. Edwards always writes her comments at the end of the essays.
Answer:
Mrs. Edwards
Step-by-step explanation:
Yes, often in the English language the antecedent of a pronoun refers to a word that will be replaced by a pronoun. But remember a pronoun simply refers to a word used instead of a noun.
From the sentence;
"Mrs. Edwards" = a noun (the antecedent)
"her" = a pronoun.