To save her during the song you have with her in Hades you can't choose the blue option to say goodbye. Any other choice during that song will give you the option to give up your godhood for her life as long as you pick options related to not accepting her death.
The way I watched the whole thing through just to make a pan edit for my brother
hi
esta genial este final, esta medusa y la amiga. Yo logre el amor de Pan y salvar a la amiga de Grace pero Medusa me es imposible que este al final
So there is a way to save Freddie.
To save her during the song you have with her in Hades you can't choose the blue option to say goodbye. Any other choice during that song will give you the option to give up your godhood for her life as long as you pick options related to not accepting her death.
I'm so glad someone did this