if the game can't explain it sufficiently without forcing me to look for outside sources it shouldn't be in it.
Yeah I kinda agree with that. But it's always a problem with games /films taking place in a vaste lore like this. Not too look too far- > Witcher. Many people found the fixation of gerald about yennefer's scent super cringe and silly. When in fact the existence of that aspect of Yen has a really tragic background to it. A background you discover only if you read the books. Or watch the new series ^^
So kinda the same shit here. Why did she help us? Only people familiar with D&D know.