I think that the daughter is in both worlds. I think she had two names in the press release. I agree though i think that the Hatter kidnapped Emma and Mary on his own though i am not sure who he kidnapped first. He may have kidnapped Mary first and tried to get her to make a hat and it didn’t work or he kidnapped Emma first. I think that this is probably the same night that Mary disappeared. Like Emma came back to check on her before she went to bed and she was gone so she went out looking right away. So i think Emma is going to get Mary back to the jail before Regina notices.