It’s a bit complicated, and almost mean spirited that RH splits his heart not out of love for her but love for their son. Personally, I think its going to be the good old fashioned TLK that revives her. And this is going to further push Regina to wanting to get her own happy ending through changing fate.
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"I could have the giant duck as my steed!" --Daniel Radcliffe
Keeper Of Tamara's Taser , Jafar's Staff, Kitsis’s Glasses , Ariel’s Tail, Dopey's Hat , Peter Pan’s Shadow, Outfit, & Pied Cloak,Red Queen's Castle, White Rabbit's Power To World Hop, Zelena's BroomStick, & ALL MAGIC