Let’s be real, assuming it is TLK that wakes her up and not some other random new magic rule that never existed before, it is going to be Rumple. It is way too anticlimactic to have Belle’s father wake her up, this is going to be the way to reform Rumple and get him to save Belle. I can’t see the show resolving this any other way. While stranger things have happened, I can’t see the show passing on a TLK opportunity like this for one of show’s main couples (even if they do have a rocky relationship.)
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"To leave an enemy without an answer, say these words to him: Aglaria Pidhol garia Ananus Qepta" and blow in his direction; then he will not know which way he is headed and cannot answer you." - Swedish Trollproverb