Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.
The first amendment is also about free religious exercise.
It is not a first ammendment issue. She can say and do what she wants. However, when it is the law of the land and you disobey it, you suffer the consequences. I disagree with the law, but that is not the point.
I admire her courage of conviction, but legally she cannot win. If she is allowed to disregard law, who shall decide what laws will and will not be obeyed?
Peaceful disobedience does not preclude consequences.