The teacher shouldn’t mention the AP score at all. There is no need for that to be in the LOR at all.
Don’t report the score and colleges won’t even know she took the test.
Again, I think you need to take a deep breath and move on. There are going to be plenty of times in college that your D is going to think she got a grade she didn’t deserve, especially if she goes to a competitive college where she’ll be graded on a curve. .