There is no solution to this. We can send her support, and fight all the people saying they're "concerned" but in reality, are body shaming her but we can't make her eat. Pointing out that she is underweight won't help her either, especially if it comes from a critical perspective.
True
Honestly the only thing we can do is to normalize people looking like they naturally "look" and hoping this will change society mindset someday.. telling her to eat isn't going to do anything while in her daily life there's people forcing her (and other idols) to be as thin as possible