It'd be easy-peasy for Froot to just say that she doesn't have that much cash to drop on a tweet that got out of hand. Mermaids are a nuclear-hot name too, so hot even the UK gov won't touch them, she could also lead with that by claiming she wanted to do more research on the best place to donate. She could have done these things whenever and it would basically kneecap the accusations, especially if she'd done it early and thrown some pity money at a charity to pretend she was serious. She hasn't, though, because it was an obvious grift she never intended to put any effort into and I hope it follows her for years to come.