Actually, I did miss that part the first time I read it.
Apparently you are unfamiliar with some of the grading practices in public high schools. “Bonus points” are a big hit with students, and, in my opinion, what that teacher was essentially saying was “If you had called this problem to my attention before the final grades were due for the report card, I would have corrected it, as I did for other students.”
From my experience, it is ALWAYS possible to change a grade, even long after the class has disbanded. I’m not certain this is true at the junior level, but I’m pretty sure she can get the test grade changed with the bonus points, as explained above.
In my opinion, “bonus points” are a bad thing. But they have been widely used to essentially keep everybody happy. Teachers are always painted as the bad guy, sometimes rightfully so. But if teacers have to teach a class and make up a new test for every student that ever misses a class, they wouldn’t be able to perform their regular duties. And that is not an exaggeration.
Grades and subsequent changes are on computer system and can be part of a challenge with administrators. Getting a grade changed in our school system is a very difficult process, mainly due to past athletic dept issues.