No vaccine has yet been approved for minors (only Pfizer was approved for 12yo and older).
But overall, I feel with your sentiments
@Love Nation . It seems like everybody is a denier of something. Whether it's the coronavirus, or the vaccine, or the government, or whatever... I mean, we have anti-vax songs out now in our country. Saw it playing in a club the other week (when it should've been closed).
And when we consider how parents can ruin their kids, this has to rank up high (without counting the, god forbid, violence or something worse). Not letting a kid go to school because her mom thinks masks are stupid? Wow... Hope your visit cheers her up. That's about as much as you can do unfortunately, apart from legal action.
As to how to convince her... I don't know. You need to pull at her heart strings. Logic won't work, and actively arguing whether or not the coronavirus exists or not is pointless and won't get you anywhere. Try to frame it like your daughter is sad and isolated, will grow up without friends etc, and fuck the mask, even if the virus doesn't exist wearing a mask won't harm her.