This is the 7307th most frequent Polish word.
kamili
"Kamili" is not a Polish word. It may be a name or from another language.
In this sentence, 'Kamili' is a name and functions as the subject in the sentence, meaning the person who performs the action.
Kamili przesłały prezent dla koleżanki.
Kamili sent a gift for her friend.
Here, 'Kamili' is used in the accusative case, referring to the person who was seen by the speaker.
Widziałam Kamili wczoraj na rynku.
I saw Kamili yesterday at the market.
The word 'Kamili' is in the dative case here, indicating the indirect object to whom an action is directed.