Nope I don't buy it. It's one character. Curio said it, they talk using "I" and "me" too much to be multiples. They finally had their hug fest because Regina finally accepted herself and chose love. Or some such bullshit. Same person, just happens to be in two bodies.
Emma didn't care because A&E suck.
And even if this wasn't the case the Evil Queen led a murderous life. It should come as little surprise to her that people aren't super keen to invite her to their little Enchanted Forest cookouts.