Is there anyway for you to get more information about the physics and calculus classes she would take at her high school?
I grew up in Kansas and Oklahoma, and went to a variety of rural schools in both. Some of them had perfectly reasonable advanced high school math and science classes. Others were terrible, and not really any better than not taking the class. The high school I was at before I left for to boarding school had calculus and physics taught by a coach who really didn’t understand the material himself, and just had students read the book on their own, and gave them tests straight from the book with no support.
Can you find out from the school what is actually covered during the year, and compare that to what would be covered in a class from outside the school? Also, can you find out what qualifications the teacher has for the class, and if previous students have felt like they had the support they needed to learn the material well?