I have to use WhatsApp for business because that is what my colleagues are wedded to. But I hate the fact that it is part of Meta, I cancelled by FB account 5 years ago and it bugs me that this last tie remains. I have however successfully migrated my whole family to SIGNAL which is vastly better than WhatsApp or Telegram, and certainly more transparent.
Think how much more of a security threat she would be if she had passed 3rd grade.