I think someone should have popped her right in the nose/mouth and physically thrown her out of the store.
I voted "pop her on the nose," but only because there were only two choices. I am opposed to any shoppers getting involved and possibly charged with assault. That would be grotesquely spun for the anti-maskers to make her into some martyr/hero.
Store security should have forcibly taken her shopping cart, not allowed her to purchase anything, and physically removed her from the store; if she attacked anyone, then tied her up and called the police.