This is the 6420th most frequent Polish word.
caroline
The word "caroline" is not a Polish word.
In this sentence, 'Caroline' is used as the name of a person, employing the accusative form 'Carolinę' to mark the direct object of the invitation action.
Carolinę zaprosiliśmy na przyjęcie.
We invited Caroline to the party.
Here, 'Caroline' is in the genitive form 'Caroliny', indicating possession of the wreath.
Zobacz, to jest wianek Caroliny.
Look, this is Caroline's wreath.
In this sentence, 'Caroline' is in the instrumental form 'Caroliną', indicating the person with whom the action of talking was performed.