The daughter of the Yamani Ambassador, ten-year-old Kethry of Mindelan, was exposed to a different culture than her native Tortall. Her decision to become the first openly female Tortallan knight meets with resistance – from the knight training master.
The first two sentences don't really flow into each other. I'd be wondering if your writing style is this disjointed. What you've left out is that in Tortall's male-dominated knighthood, there is a striking exception: Alanna, who is (can I recall now?) King's Champion, or something? So now Kethry is the first girl to go through knight training without hiding her gender.
Allowed to train, on probation, Kethry also has to deal with the prejudice of the boys and their attempts to force her to leave. While her prior Yamani training further sets her apart, it enables her to physically fight to right the wrong in the hazing – bullying – she sees. Only an anonymous benefactor gives her hope in the form of exercises for the upper body.
Nevermind about "in the form of exercises for the upper body"; it's unnecessary detail. Replace it with "of finishing her first year in training".
Kethry pushes herself to persevere through black eyes, bloody noses, and punishments for fighting and not completing her homework. The end of her year of probation brings tears as she readies herself to leave. The training master surprises everyone by allowing her to return the next year.
"Black eyes, bloody noses" is the kind of detail that's useful in this context. But I can't remember now: did the book end this anticlimactically? You had me pretty interested until that last sentence.