In a fill-in-the-blank quiz on this topic (Les enfants au restaurant)
I had written as an answer:
"Je crois qu'elle trouve plus rigolo de manger dans mon assietteplutôt que dans le sien!"
The correct answer was "...que dans la sienne."
My logic was that:
1. the pronouns takes the gender and number of the thing being replaced
...what is being replaced is "her plate," which had just been established as masculine.
2. In French, the possessive pronouns agree with the thing possessed and not the owner
3. The possessor is a singular girl, which would explain where a singular feminine "la sienne" COULD come from.
So, why does the correct answer seem to reference the possessor and not the possessed object in this example?