You seem fixated on the veracity of the bad score over the good one. Do you think your D’s excellent score in the other categories is a sham? Even if she doesn’t repeat them exactly, my hunch is that you know she is strong in reading.
I suppose it’s possible for a kid to guess right when they know nothing and luck their way into a good score, but it’s unlikely. Think of it more like a qualifying time for a swim meet. Even after swimming the qualifying time, you may not achieve the time again consistently, but the fact that you have done it once shows you are capable of it.
As for your D’s score in math, it’s possible that if she were to retake without prep, she’d do better because she’s more familiar with the format, because she mis-bubbled the first time, because the math sections were presented when she was more alert, or because she has been introduced to more concepts at school. If she does some prep, especially with someone who can help her understand more of the math concepts, she might do significantly better. I would recommend that.
Schools - and colleges with the SAT and ACT- are used to seeing more than one test. They know that it is harder to get a fluky high score than to bomb a section, and they have had decades to see how kids with different application profiles perform in their programs.
They have never relied solely on the tests, and many feel that they can assess an applicant’s readiness without a test, which is why they can be TO. They also believe that if YOU feel your test is representative of your ability that they can use that information as well. The field of test-takers is strong, so she’s in the middle of it.
In some ways, this is a question for you. How do you and your D feel about her math score? Is it a good representation of her ability/preparation? If you feel like she isn’t a strong math student, pick schools that offer a number of tracks, including those for kids who may need more support to succeed. If you feel like she’s good at math but hasn’t been well prepared at her current school, pick schools that will allow her to accelerate and make up that gap without summer sessions. Your math placement will be based on the school 's test, and they will almost certainly make it easy to move up or down if it’s wrong, so there’s nothing at stake here on that front.
While it’s hard to believe it when you are an applicant, the schools are in business to help the kids flourish, and they are going to admit the ones they think will thrive there. You may have gotten some good information here as to how you can help your D find the right place to do that. If you feel this is an accurate picture, whether you submit or not, I would pick schools where your D will get what she needs to be her best.