I think maybe we’ll see why Cora was so furious about Eva marrying Leo–maybe it was a love match for them, meanwhile she’s obviously not in love with Henry Sr.
Eva gets everything–the power AND Love. Cora’s heart goes into murderous fits of envy. Now that envy and her magic will turn her first baby…green and Rumple , who lets her know the problem also has a solution. Give the baby to him as she was SUPPOSED to do per earlier deal. Cora doesn’t want to give in though and finds another way.
She curses the baby that Eva is carrying so that IT will bear the curse–and Eva and Leo sadly send their baby away. That would make WIcked SNOW’s sister that she never knew about.
How’s that crack?
“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass