I knew the concept sounded familiar! I don't remember when I read the myth of Osiris, Seth, and Isis, but I think it was in 6th grade or something. Lovely job, babes!

Just a couple things I noticed while reading:

She'd hoped that the jealousy and rivalry that had ensued from that jealousy would've diminished after this time. You need commas after both 'jealousy's. Also, 'ensued' doesn't really fit with this sentence, you might try 'grew' instead.

she'd felt or heard nothing. 'Or' should be 'and'.