Well she either physically diverted its path or could've blown it apart like Battra, her confirmed and shown equal, which given it's implied he would do it close to the planet implies vaporization to say the least since he was trying to protect the Earth.
Well in the Heisei series, Earth itself is considered to be a 'living' entity as stated by the fairies hence why Battra was created to begin with. And the lore indicates that worldwide weather controlling machines weren't killing Earth but rather all life on Earth. So when they say "destroy Earth" and it's stated that the planet is what's at risk, I would believe them, especially since this is supported later via Godzilla's death. While the likelihood of such an object coming down is unlikely in our real world, this is a universe where monsters weighing tens of thousands of tons can move faster than the speed of light.
Energy cannot be created or destroyed. SpaceGodzilla only absorbing a partial amount of energy from an exploding star (or stars) means that he absorbed the full amount of energy. This is also supported by him NOT being immediately shredded by a black hole, which consume matter the size of stars in real life. For the monsters to survive, it had to be more durable than a star's GBE (gravitational binding energy). So unless you're going to tell me Toho is wrong, SpaceGodzilla is star level if not higher for logical reasons.
Not true, it's further support for the argument and debunks any possible notion of it being an outlier or mistranslation. If the film, comics and games all agree on the origin, it's canon without question and cannot be dismissed. Besides the IDW confirmation directly says it's based on the film's origin (though that SpaceGodzilla absorbed 600 supernovae whereas the Toho variety has various numbers in different sources)
If it was video game only information, then you would have a point, but this is a guide specifically talking about Toho's kaiju in all their different versions. Monsters that don't appear in the game, other versions, etcetera. So the confirmation SpaceGodzilla has the power of a star and has the durability to survive an encounter with a black hole is solid.
Everything you just said is wrong. Shin Godzilla is the weakest by any stretch of the imagination, given only three districts of Tokyo were damaged by his full power. The original Godzilla destroyed the entire city and was just fine. Trying to limit the others because of low end showings (Heisei broke through a tectonic plate ON SCREEN as a side effect of fighting larval Battra, that's country level, bare minimum.) It is baseless. Trying to deny Godzillas higher than their absolute baseline feats is stupid. Unless you weren't paying attention AT ALL, this shouldn't be surprising knowledge.