* She: This is the most general pronoun and is appropriate in most cases.
* Her: This is used when referring to Mrs. Coelho as the object of a verb or preposition.
* Hers: This is used when referring to something belonging to Mrs. Coelho.
* Mrs. Coelho: You can always use her full name instead of a pronoun.
Example:
* She is a kind teacher.
* The students gave her a gift.
* The book is hers.
* Mrs. Coelho arrived late for the meeting.
Choose the pronoun that best fits the sentence and the meaning you wish to convey.