"she" would be the pronoun.
You can rewrite this question as "She is your best friend?"
So in that case, "she" would be the subject.
In English, you just switch around "is" and the subject to make a question and make it sound Englishy
PS in Italian (and probably other languages) you would just say "She is your best friend?"
answer what maybe i can help
Answer:
wym i dont know i need to know were the questions are from
Explanation:
He took some of their ships.
