Meaning: This means that the female person mentioned is someone who teaches students.
Choice of Words: The word "she" refers to a female person. "Is" indicates a state of being. "Teacher" is a person who teaches students.
Alternative Expressions
She teaches.
Meaning: This means that the person being described is a female who is currently giving instruction or information to students.
Choice of Words:She refers to a female person. Teaches is a verb that describes the action of giving instruction or information to students.
She is an educator.
Meaning: This means that the person being described is a female who is responsible for educating or teaching others.
Choice of Words:She refers to a female person. Is is a verb that describes a state of being. An is an article that indicates that the following noun is singular. Educator is a noun that refers to a person who educates or teaches others.