How do I get my teacher to change my unfair grade (I am deserving)?!!!?

I worked really really hard this term to get my average in her class up to an A. I asked her right before the end of the term if I was in the 91-92% range and she said ';probably';.



She was happy with me all term... yet she gave me an 88 on my report card!!!!!!!!! (but a 90 for whole year, which does NOT go on college transcripts) I REALLY wanted an A, so I am wondering how I might email her and very politely ask her to change the grade/ ask if a mistake was made.



I am not usually very articulate with these things, so I'm wondering if anybody has any suggestions or even a sample letter I could write her.How do I get my teacher to change my unfair grade (I am deserving)?!!!?
Honestly I'd definitely write to her and ask about it. You could try something like this:

';Dear Mrs/Mr Teacher,

I got my final grade on my report card and am a little confused. You wrote in the comments 'This almost maniacal determination to earn an “A” has paid off, both in terms of his grade and in terms of the intellectual growth that has taken place this term.' but I received a ';B'; in your class. I truly appreciate your comments toward me, they make me feel like I did a very good job. However, I was under the impression that I did A-level work and was going to be receiving the grade of an ';A'; on my report card. I just wanted to know if there may have been a mistake, and if there wasn't, why I received the grade that I did. Thank you SO much for your time and for a great year/semester in your class! Sincerely, You';