I would use the word (usted), so I am referring to her in a respectful way
Me gusta is the answer fot you question
<h3>Esta piña es mi piña. correct incorrect</h3>
Answer: correct
Esta piña es mi piña.
This pineapple is my pineapple.
Explanation: "Esta" is a demonstrative adjective and "mi" is a possessive adjective.