These Two Characters are very alike in my honest opinion.

What she went through Palutena with Medusa seem similar to Nightmare Moon and Celestia.

Palutena is the Goddess of Light, and Celestia is the Alicorn of the Sun.

They both seem to have some Troll-ish Moments, Palutena more so than Celestia in my opinion, and they are both very passionate/dependent on their good friends Twilight and Pit.

I wonder how the Dialog between these two would work?

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Something like this.

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They both seem to have some Troll-ish Moments

Don't all gods?
God: Abraham, go kill your son Isaac.
*Abraham goes through several stages of regret, reasoning, and commitment before he strikes his son.*
God: Oh Abe, you took me seriously? Man, I was just kidding pal, why you so cra-cra?