I’d find another new doctor because that medical assistant is full of crap. All kids who get the vaccine get a second dose at about 4-5 years of age.
Either she’s lying about them getting bad - most doctors see very few cases of chicken pox these days. Or the cases of chicken pox are getting worse because the vaccine is leading to new, stronger strains. And pushing more vaccine will just make that worse.
Either way, she’s needlessly pushing 2 shots. To get more money from the insurance company? Or because the pharma company is pushing them in her?