Belle was okay with the would-be murder of Pan so I don’t know why she would be so up in arms over Zelena’s death especially as Zelena put everyone through hell for a whole year. Whenever Belle has asked Rumple not to hurt someone, it’s always been on his behalf rather than the other person. So I could see Belle being quite angry and disappointed in Rumple for giving into his hate and need for revenge and for lying to her, but I don’t think she’d be all that bothered by Zelena’s death.
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All magic comes with a price!
Keeper of Felix