At World Team Trophy Rika was already injured and pushing herself to compete, which I very much think was a terrible mistake but is not particularly indicative of her real abilities. I’m less sure what the situation was at Worlds, though she was in second place after the SP.
Plenty of athletes in many countries have debuted at nationals or later who were injured early in the season and gone on to do well. I’m not sure why it wouldn’t be “fair” if Rika were well enough to place top three at nationals to send her. She isn’t, so it doesn’t really matter, but I’m just surprised anyone feels like it’s okay to openly go “good, glad she’s still injured.”