I can’t say I played enough Metroid games to debate the in game logic, but from an outside perspective the ball doesn’t make sense. How does if mechanically transform with out killing her? Pocket dimension? How does it jump? How does she physically take spinning that many times with out getting sick or passing out?
Look I’m not trying to start a game science debate. Why do mushrooms make mario large, etc. I just think it’s kinda funny and a cheap trick to make the game more interesting. It’s also a product on a more forgiving era. If Master Chief turned into a ATV for Cortana to ride, no one would buy it.