In 2016, after California implemented one of the strictest vaccination laws in the country, the number of home-schooled kindergartners without shots jumped from 1,500 that year to 5,000 the next and just under 7,000 by 2018.

Parents were willing to upend their lives, quit jobs, learn the new ways of long division, hire tutors, sit down and conjugate French verbs all for the purpose of avoiding a series of injections that would protect their children and the children of other families.

The parents who have come to Ms. Mahnaz seeking guidance are not easily categorized. “They are not from any particular class, or background or religion,’’ she said. “The decision comes down to, ‘Is this that important to you or isn’t it?’ That’s the question. These parents don’t feel as though they have a choice, ” she continued. “They don’t feel as though they have been given any options.’’

What aligns them, it seems , is the feeling that their rights have been violated.

During the peak of the measles crisis earlier this year, attention was focused on vaccine resistance in a few ultra-Orthodox communities upstate and in Brooklyn, where the disease had erupted so ferociously, and among well-off bohemians drawn to the hand-knit, multigrain ways of Waldorf schools. But the clients going to see Ms. Mahnaz come from different worlds. Many are not opposed to vaccines outright. They want to reduce the number of vaccines their children get or have them administered on a schedule other than the one the state demands. They want the process to slow down.

As it stands, the law requires eight different vaccines, given at different points and according to age, in order to attend school, either public or private. Children must receive the first dose in an immunization series within two weeks of the first day that classes begin. Within a month, parents must also demonstrate that they have made appointments for follow-up doses.