Fluff cake recipe? My grandma used to make it...?

I have been searching for this recipe for years, can't find it. My grandma used to make this cake... She called it fluff cake. All I really know is that it was very light and airy, almost had the texture of meringue... I believe it contained cream cheese and/or sour cream, I really can't remember too well. I think it was no bake, I always remember it having to set in the fridge before we could eat it. And it had some kind of light crumbled crust topping.. Maybe very fine ground Graham cracker??? I don't know. If anyone has even the slightest clue, let me know! If it helps she was polish!