So, originally Snow White had black hair and blue eyes. The Red King and Crazy (not Happy, since Crazy was the one with the sweet pea bookmark) were the ones observing her from the other side of the fencing.
I think it should be around this time that Mirror took the Red King and Alice to Mirror to govern the country, since the Red King doesn't appear in later flashback scenes.
After this, the Count (Snow White's father) died, and then Mirror took Snow White's physical body over to Mirror to cheer her up. Because Snow White's physical body was in Mirror, the color of her eyes and hair changed, leaving her with red hair and white eyes (probably because Mirror is the 'reverse', so SN's color changed to the opposite color. I'm guessing that Happy, Grumpy and Crazy's colors won't change since they're in spirit form). This should be 3 years before Snow White was sent to the forest to retrieve the golden apple.
So then Snow White met the dwarves and went off searching for the golden apple, which was actually a potato.
I'm still unsure of who was killed by Mirror in the forest, apparently that might have been the 'fated prince', but the Red King was still alive in Mirror so;;;
After Snow White left the mansion in secret she was accused of poisoning her mother and in turn, killed by her mother with a poisoned apple.
Mirror and the Dwarves discover this, and Mirror freezes Snow White's body so that her body doesn't deteriorate any further. Mirror then pulls Snow White (who does not remember meeting the dwarves) so that she can make Alice the king. (The Red King is the 'fated prince', so they need him to wake Snow White's actual body, but since the Red King became king Mirror has been in a time loop, so it's impossible to take him out of Mirror as long as he is the king, so that's why everybody's trying to make Alice king). I'm not sure how they know the Red King is the fated prince though;;
So that takes us to when the Manga started.
Time probably works differently in Mirror, since the Red King was definitely taken to Mirror after Snow White was born, and the span of Snow White's lifetime is nowhere near the centuries that Mirror as existed. If that's how long Snow White has been dead for, then the Dwarves would be dead.