The way I understand things is that The Walking Dead films their season during Once Upon A Time’s break from filming. I believe they just started filming their new season, So it shouldn’t be much of a problem for her to do both shows
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Keeper of Neal/BaelFire's Blood Magic, Neverland Crossbow, FTL Clothes,Room at Granny’s, Charming & Emma’s Father/Daughter Hugs, Henry's Neverland Crossbow, Rumplestlitskin/Mr.Gold's FTL Walking Stick