>>86039098In the film, Queen Grimhilde reads the spell and knows that Snow White will be put into a "death-like sleep" by the apple. She then gets a huge kick out of the idea that the dwarves are going to see Snow White asleep, think she is dead, and presumably bury her alive. To her that's much more entertaining than just killing her. The queen wanted to trick Snow White's beloved friends into accidentally killing her, and probably took great pleasure in imagining her slowly withering away in a coffin buried in the ground.
That plan only backfired because she could not foresee that not only would the dwarves decide that Snow White was too pretty to bury and keep her in a glass coffin above ground despite the risk that she'd start to decay, but that the Prince would one day happen by and decide to kiss her corpse. Remember, when the dwarves find her they really do think she's dead, so the queen came pretty close to actually succeeding.
