Snow- death

the story of snow white, very simple:
the gorgeous girl, who run away simply because her mother needed to be the fairest of them all. she hides away with the seven dwarves, but somehow, the evil queen gets her in the end.
or is it that simple?
our snow-white, (or, snow-death) is a killer. a murderer who turned on her best friend, her sister, when she needed her the most. with white skin, blood red lips and hair as black as the night, snow- death goes from victim to victim.
but why does she do this? and we all know she can't run forever, that is everyone;
except the murderer herself.