I guess its wrong to lie to avoid your child being injected with chemicals, but its okay to lie to avoid them finding out Mickey isn't real. Only on the DIS
The point here is no one is going to forcibly vaccinate this child. There will be no consequences to the OP if she doesn't vaccinate the child. She will not be charged, fined, imprisoned, or punished in any way. It simply means that she must choose whether preschool or vaccine is more important. She just has to make a choice. A sibling having a mild reaction is notary valid medical excuse. The clvaccine isn't required, neither is preschool. No one can, or will, force the OP to go against her convictions. The OP has a choice. She can choose not to send the child to preschool this year, she can choose to send the child to preschool in another state.
To be honest, my moral compass isn't so strong on the lying thing. I see no harm intelling WDW your 3 year old is 2, or pool hopping, or poppinga few cookies from the buffet in my purse, my point here, on the Dis, that people flame others to death for minor lies but actually suggest to the OP to lie about a religious conviction she doesn't have. I actually, do find it bothersome because that makes light of someone's real religious beliefs.
OP, you have a choice, it's not one you want to make, because, essentially you want to have your cake and eat it, too. If you feel the vaccine isn't right for your child, and remember, that is only your feeling, it is not medically substantiated, takeherout ofschool.