I'm not quite on-board with your assessing this case. I believe she may have made the correct decision. The States have traditionally regulated vaXXXination. The students already have a religious exemption that they could use. Here is the Indiana Code.

IC 21-40-5-6Religious objections Sec. 6. (a) Except as otherwise provided, a student may not be required to undergo testing, examination, immunization, or treatment required under this chapter when the student objects on religious grounds.

(b) A religious objection does not exempt a student from testing, examination, immunization, or treatment required under this chapter unless the request for an exemption is:

(1) made in writing;

(2) signed by the student; and

(3) delivered to the individual who might order a test, an examination, an immunization, or a treatment absent the religious objection.

[Pre-2007 Higher Education Recodification Citation: 20-12-71-14.]

As added by P.L.2-2007, SEC.281.

Furthermore, they could have used a medical condition as well.

IC 21-40-5-4Exemption from immunization Sec. 4. An exemption relieving a student from the requirements of section 3 of this chapter may be accepted by the state educational institution as part of the documentation of exemption for the following reasons:

(1) If a health care provider makes a written statement indicating the nature and probable duration of a medical condition or circumstances that contraindicate an immunization, identifying the specific vaccine that could be detrimental to the student's health.

(2) If pregnancy or suspected pregnancy is certified in a written statement from a health care provider.

(3) If a health care provider provides written documentation that the student is in the course of completing an approved schedule of all necessary doses of the vaccines required for the diseases listed in section 2 of this chapter.

If the student's medical condition or circumstances subsequently permit immunization, the exemptions granted by this section terminate and the student shall obtain the immunizations from which the student has been exempted.

[Pre-2007 Higher Education Recodification Citation: 20-12-71-13.]

As added by P.L.2-2007, SEC.281.

I believe these students may have been working for the enemy and wanted to SCOTUS to rule on mandatory vaXXXination. The precedent has been leaning toward mandatory vaXXXination since the early part of last Century.