Maybe Belle is being given her own story that doesn’t involve the main group. I imagine freeing Rumple from the WW is going to be a difficult task. Belle might be using the main group as a distraction. Whilst WW is focussed on Regina and the main group, she’s not paying close attention to what Belle is doing. It’s possible that Rumple needs to be freed before the main group attack WW because otherwise WW could use Rumple to annihilate them all.
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All magic comes with a price!
Keeper of Felix