I actually believe in God but I also don't feel like trying to change the stubborn minority of there believes as such I try to leave it up to the reader.

He could but that could have consequences as the Space would either identify Thalia as tree or as a spirit not as a demi-god. That and the system isn't leveled up enough to be able to heal her at this point in time.

There's actually two versions of the story in one of them out of spit Athena curse Arachne into her spider form and then another version where she repents for diving Arachne to commit suicide by turning her into a spider hybrid.

Nice catch.