Overboard?

My daughter lives with her dad & stepmom mainly & comes to my house on the weekends. Lately, she has been bitching at me because she finds the baggies with my daughters vitamins she's supposed to take every day & wants me to literally watch her chew & swallow both gummies every morning. I have a 2 year old also who is on the bullshit the SECOND he gets up so that is damn near impossible. She insists these vitamins are so important because of covid, like they're gonna protect her against it or something. Im so frustrated.