She can attend or not, it is her choice, again no one is forcing her and therefore no one is limiting her constitution rights.
Each and every citizen has the right to be unimpeded in their exercise of religion by any citizen, or the government. What has no place and is a crime is what you advocate, which is to violate religious rights in direct opposition to the plain English wording of the 1st Amendment.
We all have the "right" to practice religion. The question is do we all have the right to practice our religion where ever and whenever we please? If so are instituions prohibited to set up rules and regulations unless it passes the religious police? Once schools are required to have to take into consideration religion over school matters the public school system is going to be unable to make any rules.
... That is not exercise of religion, it is religious education
It is both.
You are limiting her ability to partake in what is open to all regardless of sex, religion, national origin, whatever. You are advocating violating her rights and the Bill of Rights. "The question is do we all have the right to practice our religion where ever and whenever we please?"
It's a public place. You have the right to practice it w/o interference by anyone.
"are instituions prohibited to set up rules and regulations unless it passes the religious police?
There is no religious police and this is a school. If the folks in the town, on the school board, in the admin and in the classroom are too dumb to know what is and what is not religious then the State folks, or the feds have to step in and teach them what reality is and how they may avoid wasting time and money engaging in rights violations.