Well...everyone already pointed out all that is wrong in this story....which is everything
Stupidity for the sake of story is really just stupid....a goddess that gives a kid a deadly disease just so she can learn how to use her power by giving it to a monster (how can't this girl feel betrayed), a god that accept a new healing spell without testing it, a mc that forgives everything, people that don't check a prisoner before detaining her, gods that give mc godly powers instead of sending her back, those same gods that don't intercept isabelle teleport when they just did for mc.....truly, author should just drop this story, apologize for creating such a stupidity circus and try to start something new and making it decent this time.....
How to fuck up a story and show how dumb the author is 101....I suggest you don't take notes here folks