Should I talk to my professor about my grade?
To expand Bob Brown's answer, yes, you should talk to your professor politely with the objective how to improve your study in the future.

In my opinion, your grade is probably on the borderline between A and B. You need to ask her what grade you got for the final paper (worth 25% of the grade). [E]veryone said that it was a really good paper, and that it deserves an A is not enough for you to say you did get an A on it. You need ask her how well was your final paper.

Generally speaking, it's not easy to change a grade after it's out of the professor's office unless there was an obvious calculation error.So, don't expect she will change your grade from B to A unless your final paper was extremely well written.

I won't be surprised if she tells you that your final paper was okay but not good enough for an A. In that case, you should ask her what you can do to improve your writing skills so that you can get better grades for the future essay writing assignments in other courses. Good luck!