I posted on another thread that I think we are missing some other details of the story. I think this is only the beginning of the story. I have the feeling that the reason Regina has harbored so much resentment isn’t entirely because of Daniel’s death. Over that past few episode’s I have felt like I have seem slight moments of regret in Regina of being stuck with being evil – but because she IS evil – those moments are EXTREMELY brief. I think what she is REALLY resentful of is being evil in and of itself. I think that she really blames her mother for Daniel’s death and I think we saw that at the end of the episode. After Regina’s voice changed, she turned back to her mother and realized that the whole thing had been set up by her mother – Snow’s horse taking off was because of her mother’s magic. It sounds like Cora goes to the Castle with Regina. I think Regina kills her mother and inherits her evilness and then ends up blaming Snow for THAT because after she has killed her mother for Daniel’s death she turns her vengence onto Snow, and then recognizes the person she has become. Remember the scene before she decides to rip her father’s heart out? It’s like she has become obsessed – her whole life has become an obsession – and the only person left to blame it on is Snow. By that point she has killed the King as well. I think we will see some other things happen as well. Because Snow seemed to love Regina and was excited about getting a new mother. Yet in later episodes at the castle she seemed almost oblivious to the fact that fact that Regina was there – so something happened that made them almost unaware of each other.