Board Thread:Spoilers!/@comment-4877635-20150218173447/@comment-24674051-20150420153043

There is a slight difference between Season 1 and Now. In season 1, All Emma had to go on was the word of a 10 year old kid, who claimed that he was her son. Emma was someone who had trust issues (still does, for that matter), and did not believe anything without solid proof.

we don't know much about Lily, but when she arrives in Storybrooke, she is going to know Emma. She may be pissed at her, and rightfully so, but she is going to have a whole lot more to go on than Emma did. She may also not have the belief issues that Emma had.

Also, I doubt Lily will just "up and believe". we have 2 episodes ("Lily" and "Mother") to introduce the Adult version of Lily, and those will probably involve her coming to terms with HER EF heritage, and the fact that she is the daughter of "the Mistress of all Evil".