In one of the answers to a test it says
Est-ce ta trousse? - Oui, c'est la mienne.Is this your pencil case? - Yes, this is mine.
Going by this lesson here, would it be correct to say
Est-ce ta trousse? - Oui, elle est la mienne.Is this your pencil case? - Yes, it is mine.
The difference being between THIS and IT.