You may disagree with her position, but I don't think her position on this is unclear.
I could never understand the vax=anti-vax arguments. Especially with schools.
If it is voluntary, and a child gets sick, I can only surmise that those who have been inoculates are protected and won’t get sick while those who haven’t been inoculated are aren’t protected and may get sick.
The only issue I see here is the government is forcing me to inoculate my child. The only risk of this spreading is to children who have chosen not to be inoculated.