This is the 826th most frequent Italian word.
valentina
"Valentina" is an Italian female given name, equivalent to "Valentine" in English.
Here, 'Valentina' is a proper noun serving as the subject of the sentence, naming a specific person.
Valentina è una mia cara amica.
Valentina is a dear friend of mine.
In this context, 'Valentina' refers to a place or person, likely a shop or an individual's enterprise.
Ho comprato un profumo da Valentina.
I bought a perfume at Valentina's.
In this example, 'valentina' is used in a derivative or figurative sense, describing an evaluation or valorization, though this is less standard usage.